Improve mocking setup and added verification test for fault.py

[hmarts9]

This PR enhances the unit testing framework for the fault.py module by improving the mocking setup and adding a verification test. The main changes are:

1. Updated mocking setup:

   • Implemented "patch.multiple" to mock both "get_data_at_time" and "get_values_over_time_range" functions from the archiver module.

2. Added a verification test:

   • Introduced a new test method "test_mocks_are_applied()" to make sure that the mocking setup is working correctly.
   • This test checks that the mock objects have successfully replaced the original functions in the module.

[lisazacarias]

@hmarts9 can we resolve the merge conflicts and see if we can merge it in?

[lisazacarias]

I don’t know what merge conflicts are left but the tests look great! Thanks again!