[Key Vault] Modify C# customizations and config for Key Vault Administration

[JonathanCrd]

SDK configuration pull request

Purpose of this PR

• Make changes to the SDK configuration only when there are no modifications to the API specification, eliminating the need for an ARM or Stewardship Board API review.

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and followed the instructions by checking all the boxes:

• I confirm this PR is modifying only SDK configurations, and not API related specifications.
• I have reviewed and used the respective tspconfig.yaml templates:
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  • Data plane tspconfig template

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Generated ApiView

Language	Package Name	ApiView Link
Python	azure-keyvault-administration	https://apiview.dev/Assemblies/Review/7643acce229a47c8a2d146efc30638fb?revisionId=971c670572704b0ab0addff430764faa

[mccoyp]

Love to see so much simplification!

[wanlwanl]

@jianingwang123 this should be the root cause