QA Integration tests stabilization - Epic implementation

[DProvinciani]

Hello team,

This PR includes all the necessary changes developed as part of the epic #979. Check the list of closed issues for details related to the executions to validate that the tests are passing successfully.

• Closes Authd agents_ctx test case fails because agent-info folder doesn't exist anymore #974: Fix for the authd test cases to stop using the agent-info files.
• Closes Relocate the SCA integration tests to a legacy tests folder #987: Relocation of the SCA integration tests to a legacy integration tests folder.
• Closes Document the execution of the SCA integration testing project #988: Documentation of the SCA integration tests.
• Closes Mark as xfail key-polling and behind_proxy_server tests. #985: Marking as xfail some framework integration tests for features that are still under development.
• Closes Analyze and fix the issues reported in the gcloud integration tests #994: Fix for the gcloud integration tests.
• Closes Parametrize the WPK integration tests #990: Parametrization of the WPK integration tests in order to allow specifying the Wazuh version.

Tests checks

• Proven that tests pass when they have to pass
• Proven that tests fail when they have to fail
• Proven that tests have the expected behavior in RPM and DEB
• Checked that all vulnerability detector tests work correctly (my changes don't break anything)

Best regards.

[chemamartinez]

LGTM