Disable misfiring SharePoint functional tests temporarily

[schrolla]

🐛 Summary

A small set of tests in the SharePoint functional test plans seem to exercise an unexpected response from the SharePoint API service. As such, it causes the entire functional test plan to fail due to a small number of tests. This update disables those tests to allow the rest of the test plan to pass.

To reproduce

Steps to reproduce the behavior:

1. Review existing functional test plan scheduled runs such as:
   https://github.com/cisagov/ScubaGear/actions/runs/12194090461/job/34046994902
2. Run functional test workflow or manually run SharePoint PnP test plan.

Expected behavior

Expected the test plan to pass successfully.

Any helpful log output or screenshots

Example of error shown when SharePoint service setting is not correctly changed despite test pre-condition successfully setting the SharingCapability to the required value stated in the error.