Enable some high value Error Prone checks for turbine

More string view pre-work: these checks are helpful when migrating uses of String that are e.g. passed to `equals(Object)` on a collection of the wrong type.

PiperOrigin-RevId: 689964619

pom.xml

@@ -188,7 +188,7 @@
             <arg>-parameters</arg>
             <arg>-XDcompilePolicy=simple</arg>
             <arg>--should-stop=ifError=FLOW</arg>
-            <arg>-Xplugin:ErrorProne</arg>
+            <arg>-Xplugin:ErrorProne -Xep:EqualsIncompatibleType:ERROR -Xep:TruthIncompatibleType:ERROR</arg>
           </compilerArgs>
           <annotationProcessorPaths>
             <path>