Fabric Mirroring Review Fixes

[mohitsinha-ms]

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[mohitsinha-ms]

Addresses 4 ARM API review comments on FabricMirroringSettings from PR #39083:

1. Fix singleton naming — FabricMirroringSettingsName union, lowercase "default" in examples
2. Remove deprecated 202 from PUT — Dropped ArmAcceptedLroResponse + suppression, async headers on 201
3. Fix list pagination — ArmListSinglePageByParent → ArmResourceListByParent
4. Fix FIXME suppression — Proper justification for server-intrinsic singleton

Only Fabric Mirroring changes. ReaderEndpoint/Rename Server not addressed here.

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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
TypeSpec	Microsoft.DBforMySQL
Go	sdk/resourcemanager/mysql/armmysqlflexibleservers
Python	azure-mgmt-mysqlflexibleservers
C#	Azure.ResourceManager.MySql
Java	com.azure.resourcemanager:azure-resourcemanager-mysqlflexibleserver

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[mohitsinha-ms]

Review: Resource accepted arbitrary 3-24 char names but is a singleton. Name MUST be lowercase default with enum.

Fix: Added FabricMirroringSettingsName union with Default: "default", updated ResourceNameParameter with Type, all examples use lowercase default.

[mohitsinha-ms]

Addresses: BLOCKING — Suppression Criteria / RPC-Delete-V1-05 (Fix FIXME suppression)

Review: Placeholder FIXME suppression masks real contract gap (no DELETE on proxy resource).

Fix: Replaced with definitive justification. Same pattern as AdvancedThreatProtection and Configuration which also suppress DELETE.

[mohitsinha-ms]

Review: Async PUT returning 202 is deprecated for new resource types.
Fix: Removed ArmAcceptedLroResponse + suppression. PUT returns 200/201 only with async LRO headers.

[mohitsinha-ms]

Review: ArmListSinglePageByParent with nextLink is inconsistent.
Fix: Replaced with ArmResourceListByParent to emit x-ms-pageable.

[judyzhu10]

Does your API support pagination? Does this change match your API definition?

[mohitsinha-ms]

FabricMirroringSettings is a singleton (only 'default' allowed), so the list always returns at most 1 item and pagination is not functionally needed.

However, the ARM reviewer flagged that the previous ArmListSinglePageByParent was inconsistent -- it exposed nextLink in the response schema without x-ms-pageable.

So I thought Using ArmResourceListByParent resolves this inconsistency and matches the pattern used by all other list operations in this service (AdvancedThreatProtection, Configuration, Database, etc.). The service should return nextLink: null in responses.