Added new API Flexible FIC as part of new API Version for 2025-01-31-preview

[JamilOmar]

ARM (Control Plane) API Specification Update Pull Request

Referenced closed PR from azure-rest-api-specs: #32599
Referenced PR from azure-rest-api-specs-pr : https://github.com/Azure/azure-rest-api-specs-pr/pull/21162

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PR review workflow diagram

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Purpose of this PR

What's the purpose of this PR? Check the specific option that applies. This is mandatory!

• New resource provider.
• New API version for an existing resource provider. (If API spec is not defined in TypeSpec, the PR should have been created in adherence to OpenAPI specs PR creation guidance).
• Update existing version for a new feature. (This is applicable only when you are revising a private preview API version.)
• Update existing version to fix OpenAPI spec quality issues in S360.
• Convert existing OpenAPI spec to TypeSpec spec (do not combine this with implementing changes for a new API version).
• Other, please clarify:
  • edit this with your clarification

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 Azure Resource Manager (ARM) related specifications, and not data plane related specifications.
• I have reviewed following Resource Provider guidelines, including
  ARM resource provider contract and
  REST guidelines (estimated time: 4 hours).
  I understand this is required before I can proceed to the diagram Step 2, "ARM API changes review", for this PR.

Additional information

Viewing API changes

For convenient view of the API changes made by this PR, refer to the URLs provided in the table
in the Generated ApiView comment added to this PR. You can use ApiView to show API versions diff.

Suppressing failures

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Getting help

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[openapi-pipeline-app]

Next Steps to Merge

Next steps that must be taken to merge this PR:

• ❌ This PR is in purview of the ARM review (label: ARMReview). This PR must get ARMSignedOff label from an ARM reviewer.
  This PR is not ready for ARM review (label: NotReadyForARMReview). This PR will not be reviewed by ARM until relevant problems are fixed. Consult the rest of this Next Steps to Merge comment for details.
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• ❌ This PR is NotReadyForARMReview because it has the BreakingChangeReviewRequired label.
  
• ❌ This PR has at least one breaking change (label: BreakingChangeReviewRequired).
  To unblock this PR, follow the process at aka.ms/brch.
• ❌ The required check named Breaking Change(Cross-Version) has failed. To unblock this PR, follow the process at aka.ms/brch.

[openapi-pipeline-app]

Generated ApiView

Language	Package Name	ApiView Link
Go	sdk/resourcemanager/msi/armmsi	There is no API change compared with the previous version
JavaScript	@azure/arm-msi	https://apiview.dev/Assemblies/Review/9b614385f9a24a0c9bdf72a6ee655477?revisionId=45f5b674a76b45398ac26659496a5c48
Java	azure-resourcemanager-msi-generated	https://apiview.dev/Assemblies/Review/435b242f71b443a39f0e21273f6085fb?revisionId=0b0093c88f6a45a5b22eb01c38feaf41
Python	azure-mgmt-msi	https://apiview.dev/Assemblies/Review/08c84b7ea1a34c72b190533bc9c6d0c9?revisionId=88d52c55fd364751abbaf1f80e7d4b0a
.Net	Azure.ResourceManager.ManagedServiceIdentities	There is no API change compared with the previous version

[azure-sdk]

API change check

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

Microsoft.ManagedIdentity

[JamilOmar]

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