add 2025-06-20-preview api version

[kekachmar]

ARM (Control Plane) API Specification Update Pull Request

Moving from private to public repo.
Copied from: https://github.com/Azure/azure-rest-api-specs-pr/pull/23248

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• 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).
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  • edit this with your clarification

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To merge this PR, you must go through the following checklist and confirm you understood
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• 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).
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• A release plan has been created. If not, please create one as it will help guide you through the REST API and SDK creation process.
  (for a previous version we discussed with @mentat9 that this shouldn't block us)

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API Change Check

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

Language	API Review for Package
Swagger	Microsoft.FluidRelay
JavaScript	@azure/arm-fluidrelay
Go	sdk/resourcemanager/fluidrelay/armfluidrelay
C#	Azure.ResourceManager.FluidRelay
Python	azure-mgmt-fluidrelay

[razvanbadea-msft]

The first commit needs to be an exact copy of the previous API version. All new changes should only be added in the subsequent commits.
This allows the reviewer to get a clear understanding of the actual changes being introduced. With the way the PR is raised now, it is not possible for the reviewer to tell what the changes are. Please either abandon the PR and raise another one with the recommendation or create a new set of commits on this PR following the recommendation. If you are doing the later option please indicate which commit is the exact copy of the previous version.

[kekachmar]

The first commit needs to be an exact copy of the previous API version. All new changes should only be added in the subsequent commits. This allows the reviewer to get a clear understanding of the actual changes being introduced. With the way the PR is raised now, it is not possible for the reviewer to tell what the changes are. Please either abandon the PR and raise another one with the recommendation or create a new set of commits on this PR following the recommendation. If you are doing the later option please indicate which commit is the exact copy of the previous version.

@razvanbadea-msft, please see this commit f3c1a60
It is a copy of 2022-06-01 stable version. I've added the new changes after that one.
For reference, here is the review for the private repo: https://github.com/Azure/azure-rest-api-specs-pr/pull/23248