[BUG] two copies of PiiDetectionSkillMaskingMode.cs varying only by case are present

[idg10]

Describe the bug
As of 2789b52 the repo contains both this:

sdk/search/Azure.Search.Documents/src/Generated/Models/PIIDetectionSkillMaskingMode.cs

and this:

sdk/search/Azure.Search.Documents/src/Generated/Models/PiiDetectionSkillMaskingMode.cs

Note that the first three letters of the file vary only by case. (PII vs Pii.)

It looks like after updating Autorest, the name of this generated file changed the casing, but I believe these are logically meant to be the same file.

Expected behavior
There should be just one copy of this file, probably cased as PiiDetectionSkillMaskingMode.cs (i.e., the PIIDetectionSkillMaskingMode.cs copy should have been deleted when the one starting Pii was added).

Actual behavior (include Exception or Stack Trace)
Two copies of the file with different casing are present.

To Reproduce
This is most easily seen by cloning the repo in Windows, which will produce this warning:

warning: the following paths have collided (e.g. case-sensitive paths
on a case-insensitive filesystem) and only one from the same
colliding group is in the working tree:

  'sdk/search/Azure.Search.Documents/src/Generated/Models/PIIDetectionSkillMaskingMode.cs'
  'sdk/search/Azure.Search.Documents/src/Generated/Models/PiiDetectionSkillMaskingMode.cs'

Environment:
GitHub. (The problem is in the repo.)

[jsquire]

//fyi: @christothes

[jsquire]

Thank you for your feedback. Tagging and routing to the team member best able to assist.