Change regexp in WebTerminalUnderRegularUser

[musienko-maxim]

What does this PR do?

Make regexp for verification help command more flexible.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

How to test this PR?

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix or new feature
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[dmytro-ndp]

Please, fix Empty Workspace PR test failure before the merge:
https://github.com/eclipse/che/actions/runs/8174142878/job/22348238366

Run cd tests/e2e
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '[email protected]',
npm WARN EBADENGINE   required: { node: '>=[18](https://github.com/eclipse/che/actions/runs/8174142878/job/22348238366#step:9:19)' },
npm WARN EBADENGINE   current: { node: 'v16.20.2', npm: '8.[19](https://github.com/eclipse/che/actions/runs/8174142878/job/22348238366#step:9:20).4' }
npm WARN EBADENGINE }
npm ERR! code EUSAGE
npm ERR! 
npm ERR! `npm ci` can only install packages when your package.json and package-lock.json or npm-shrinkwrap.json are in sync. Please update your lock file with `npm install` before continuing.
npm ERR! 
npm ERR! Invalid: lock file's chromedriver@1[20](https://github.com/eclipse/che/actions/runs/8174142878/job/22348238366#step:9:21).0.1 does not satisfy chromedriver@1[22](https://github.com/eclipse/che/actions/runs/8174142878/job/22348238366#step:9:23).0.4
npm ERR! Invalid: lock file's [email protected] does not satisfy [email protected]
npm ERR! Missing: [email protected] from lock file
npm ERR! Invalid: lock file's [email protected] does not satisfy [email protected]
npm ERR! Missing: [email protected] from lock file
npm ERR! Invalid: lock file's [email protected] does not satisfy [email protected]
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: @tootallnate/quickjs-emscripten@0.[23](https://github.com/eclipse/che/actions/runs/8174142878/job/22348238366#step:9:24).0 from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file
npm ERR! Missing: [email protected] from lock file

[musienko-maxim]

Fixed

[dmytro-ndp]

looks good to merge