Update file share API according to review comments

[EmmaZhu]

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• Added impacted package name to the issue description
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PR Overview

This PR updates the file share API to consolidate Linux/UNIX file metadata into a single posixProperties object rather than using separate properties for owner, group, fileMode, fileType, and linkCount. The changes span client methods, generated models, and associated tests to reflect this design consolidation.

• Updated client methods to wrap raw responses with a unified posixProperties object.
• Modified API model definitions and generated API documentation to remove separate NFS-related properties.
• Adjusted tests to assert on posixProperties rather than separate fields.

Reviewed Changes

File	Description
sdk/storage/storage-file-share/src/Clients.ts	Updated client methods to construct posixProperties from rawResponse.
sdk/storage/storage-file-share/review/storage-file-share.api.md	Modified API definitions to use posixProperties for NFS properties.
sdk/storage/storage-file-share/src/models.ts	Updated the FilePosixProperties interface to include linkCount and adjusted comments.
sdk/storage/storage-file-share/src/generatedModels.ts	Updated model imports and definitions to rely on posixProperties.
sdk/storage/storage-file-share/test/*.spec.ts	Updated tests to assert on posixProperties instead of individual NFS properties.

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (3)

sdk/storage/storage-file-share/src/Clients.ts:1829

• [nitpick] Ensure that the naming and ordering of properties within the posixProperties object (e.g., fileMode, fileType, owner, group, linkCount) matches the documentation and is consistent across all client methods.

posixProperties: {

sdk/storage/storage-file-share/review/storage-file-share.api.md:203

• [nitpick] Confirm that the removal of separate NFS fields in favor of posixProperties is clearly documented and that the API reference accurately reflects this consolidated design.

posixProperties?: FilePosixProperties;

sdk/storage/storage-file-share/test/directoryclient.spec.ts:2543

• [nitpick] Review the test assertions to ensure that all relevant NFS properties (including linkCount and fileType) are properly validated in both creation and retrieval scenarios.

assert.deepEqual(cResp.posixProperties?.owner, posixProperties.owner);

[azure-sdk]

API change check

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

@azure/storage-file-share

[jeremymeng]

LGTM

[blueww]

LGTM