BE: RBAC: Add integration test for Active Directory auth

[wernerdv]

• Breaking change? (if so, please describe the impact and migration path for existing application instances)

What changes did you make? (Give an overview)
Added integration test for Active Directory auth.

Is there anything you'd like reviewers to focus on?

How Has This Been Tested? (put an "x" (case-sensitive!) next to an item)

• No need to
• Manually (please, describe, if necessary)
• Unit checks
• Integration checks
• Covered by existing automation

Checklist (put an "x" (case-sensitive!) next to all the items, otherwise the build will fail)

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. ENVIRONMENT VARIABLES)
• My changes generate no new warnings (e.g. Sonar is happy)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

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[wernerdv]

@Haarolean After merging 85330e8, new tests fail with the error:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'configureLdap' defined in class path resource [io/kafbat/ui/config/auth/LdapSecurityConfig.class]: Failed to instantiate [org.springframework.security.web.server.SecurityWebFilterChain]: Factory method 'configureLdap' threw exception with message: java.io.FileNotFoundException: class path resource [static/index.html] cannot be opened because it does not exist
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:648)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:636)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1355)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1185)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:562)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:337)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1689)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1653)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeanCollection(DefaultListableBeanFactory.java:1543)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1511)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1392)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1353)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.resolveMethodArguments(AutowiredAnnotationBeanPostProcessor.java:888)
	... 128 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.web.server.SecurityWebFilterChain]: Factory method 'configureLdap' threw exception with message: java.io.FileNotFoundException: class path resource [static/index.html] cannot be opened because it does not exist
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:178)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:644)
	... 145 common frames omitted
Caused by: java.lang.RuntimeException: java.io.FileNotFoundException: class path resource [static/index.html] cannot be opened because it does not exist
	at io.kafbat.ui.util.StaticFileWebFilter.<init>(StaticFileWebFilter.java:35)
	at io.kafbat.ui.util.StaticFileWebFilter.<init>(StaticFileWebFilter.java:26)
	at io.kafbat.ui.config.auth.LdapSecurityConfig.configureLdap(LdapSecurityConfig.java:157)
	at io.kafbat.ui.config.auth.LdapSecurityConfig$$SpringCGLIB$$0.CGLIB$configureLdap$5(<generated>)
	at io.kafbat.ui.config.auth.LdapSecurityConfig$$SpringCGLIB$$FastClass$$1.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:258)
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:348)
	at io.kafbat.ui.config.auth.LdapSecurityConfig$$SpringCGLIB$$0.configureLdap(<generated>)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:146)
	... 146 common frames omitted
Caused by: java.io.FileNotFoundException: class path resource [static/index.html] cannot be opened because it does not exist
	at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:215)
	at io.kafbat.ui.util.ResourceUtil.readAsString(ResourceUtil.java:16)
	at io.kafbat.ui.util.StaticFileWebFilter.<init>(StaticFileWebFilter.java:33)
	... 156 common frames omitted

In general, this can be fixed by building the project mvnw clean install -DskipTests -Pprod before running the tests.
I checked it locally - the tests pass.
What do you think about this?