added dotnet specific ovverides for EKM clients

[hari9-9]

SDK configuration pull request

Purpose of this PR

• Added client's for EKM and marked them as internal for Dotnet SDK following the same pattern as other clients in the SDK

• This would help autogenerate the SDK changes

• [✅] 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.

Due diligence checklist

To merge this PR, you must go through the following checklist and confirm you understood
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:
  • Data plane tspconfig template

[github-actions]

Next Steps to Merge

✅ All automated merging requirements have been met! To get your PR merged, see aka.ms/azsdk/specreview/merge.

Comment generated by summarize-checks workflow run.

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
TypeSpec	KeyVault
Python	azure-keyvault-administration
JavaScript	@azure/keyvault-admin

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Comment generated by After APIView workflow run.

[mikeharder]

i think avocado failure is because the check requires case-sensitive readme.md. you have a different casing README.md. create a new PR to main, just renaming your readme.md to the correct casing. i can approve that PR if needed.

[hari9-9]

Added avacado approved label as there exist a bug tracking the issue of avacado failures while transition from non-date based api version to date-based api version.

Azure/avocado#159

[hari9-9]

Added Approved Suppression as we dont have Suppression review for DP Changes as Per: #37987