Fix duplicate TestDrive setup

[yourlastnamesoundslikeatypeofpasta]

Summary

• remove redundant TestDrive creation logic

File Citations

• tests/TestHelpers.ps1

Test Results

Starting discovery in 76 files.
Discovery found 445 tests in 1.92s.
Starting code coverage.
Running tests.
New-PSDrive: A drive with the name 'TestDrive' already exists.
[-] AddUsersToGroup Script.connects and disconnects from Graph 849ms (367ms|482ms)
 RuntimeException: Test failed in : [Framework failed:
 Result 1 - Error 1:MethodInvocationException: Exception calling "Add" with "2" argument(s): "Item has already been added. Key
 in dictionary: 'TestDrive'  Key being added: 'TestDrive'
... (truncated)

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https://chatgpt.com/codex/tasks/task_e_6848114d06e0832c9c2814443ca2c256