remove csharp config for netapp

[ArcturusZhang]

SDK configuration pull request

Purpose of this PR

CSharp is not ready to generate this RP from typespec yet. We should not have this configuration.

• 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:
  • ARM tspconfig template
  • Data plane tspconfig template

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[github-actions]

Next Steps to Merge

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[github-actions]

API Change Check

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

Language	API Review for Package
Go	sdk/resourcemanager/netapp/armnetapp
Python	azure-mgmt-netapp

[ArcturusZhang]

Added ArmSignedOff label because this PR only changes SDK config, no need for ARM review.