Added test from CLIAction

[lifefire1]

See JENKINS-70464

Testing done

I added a comprehensive set of unit tests for the CLIAction class, which include the following scenarios:

• Test for the doCommand() method: Verifies that a 404 error is returned when an invalid command is requested.
• Test for the doCommand() method with a valid parameter: Checks that the correct view dispatcher is called and forwarded when a valid command is provided.
• Tests for WebSocket-related behavior:
  • Verifies that a WebSocket connection is not supported.
  • Checks the behavior when the origin header is invalid.
  • Ensures that WebSocket connections are allowed only if both conditions (WebSocket support and allowed origin) are met.
  • Verifies that a Forbidden response is returned when WebSocket connections are not allowed.

All tests were executed successfully on a local Jenkins instance.

Proposed changelog entries

• Added unit tests for CLIAction class methods and WebSocket handling.
• Improved test coverage for CLI commands and WebSocket connection handling.

Proposed upgrade guidelines

N/A

---

Pull Request Template

[tasklist]
### Submitter checklist
- [x] The Jira issue, if it exists, is well-described.
- [x] The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood.
- [x] There is automated testing or an explanation as to why this change has no tests.
- [x] New public classes, fields, and methods are annotated with @Restricted or have @since TODO Javadocs, as appropriate.
- [x] New deprecations are annotated with @Deprecated(since = "TODO") or @Deprecated(forRemoval = true, since = "TODO"), if applicable.
- [x] New or substantially changed JavaScript is not defined inline and does not call eval to ease future introduction of Content Security Policy (CSP) directives.
- [x] For dependency updates, there are links to external changelogs and, if possible, full differentials.
- [x] For new APIs and extension points, there is a link to at least one consumer.

[lifefire1]

I might have misunderstood the task or made some mistakes, so I am always open to comments. I want to learn this project, so I decided to try it with tests.

[daniel-beck]

Remove and move the test to test/src/test/

[daniel-beck]

See JENKINS-70464

The ticket seems unrelated to this PR, could you explain how they relate?

[lifefire1]

Perhaps you are right and I really indicated the wrong ticket. I wanted to improve test coverage as a first step

[A1exKH]

@lifefire1 code in this PR LGTM.
Please update description of this PR, because it doesn't match with code now.