fix(gitlab): vcs gitlab groups retrieval

[maxamel]

Description

This PR fixes an issue in vcs gitlab groups retrieval. One part is in schema validation, and the second in the logic of failing checks.

Checklist:

• My code follows the style guidelines of this project
• 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
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[marynaKK]

I think that maybe require_two_factor_authentication is not a required field (although the schema down here states it is required - from the docs: https://gitlab.com/gitlab-org/gitlab/-/blob/master/doc/api/groups.md)
Hence in case there is no require_two_factor_authentication the schema will be filtered and will not get here

[maxamel]

Looks like the docs state that require_two_factor_authentication is not mandatory on PUT/POST operations, since it defaults to False. But on retrieval it is always returned.

[marynaKK]

You are correct! missed the difference :)

[gruebel]

☕