Post GA Az CLI improvement on Microsoft.FileShares resource provider

### Preconditions

- [x] No need to upgrade Python SDK or the Python SDK is ready.

### Related command

_No response_

### Resource Provider

Microsoft.FileShares

### Description of Feature or Work Requested

Currently the feature team is working on generating the Az CLI preview package for Microsoft.FileShares resource provider. The feature will be GA in May 15th. And CLI team will help generate the GA version shortly after the GA time. From May 15th to August 15th, the feature will add on some feature support that will require improvements on the CLI as well. This request is asking the CLI team to provide support for the add ones after the Microsoft.FileShares have been GA.

### Minimum API Version Required

2026-08-01

### Swagger PR link / SDK link

Will share the API repo once it is ready.

### Request Example

_No response_

### Target Date

2026-08-15

### PM Contact

rongpuliu

### Engineer Contact

kszobi

### Additional context

Microsoft.FileShares resource provider (MFS) team have frequent communication with Zhiyi Huang. Zhiyi has more context on the status of the CLI package. Thanks.