test added for updating multiple flightpath docking widget for new operations (enabled signals and slots)

[ReimarBauer]

Purpose of PR?:

Fixes #2269

Does this PR introduce a breaking change?

If the changes in this PR are manually verified, list down the scenarios covered::

Additional information for reviewer? : Mention if this PR is part of any design or a continuation of previous PRs

Does this PR results in some Documentation changes? If yes, include the list of Documentation changes

Checklist:

• [ ] Bug fix. Fixes #2269
• [ ] New feature (Non-API breaking changes that adds functionality)
• [ ] PR Title follows the convention of <type>: <subject>
• [x] Commit has unit tests

Starting with the test

[ReimarBauer]

@joernu76 this did not fix the issue but added the test and the infrastructure that it gets to the reload_operation function. Because @rohit2p has a project on the multiple flightpath docking widget and may came to the same problem, I guess there is a good chance that after the project this test also works.

[ReimarBauer]

There is no need to merge this now.