[Storage] content_length -> size for PageBlobClient create API

[vincenttran-msft]

As title states.
.tsp: Azure/azure-rest-api-specs#39097

[github-actions]

API Change Check

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

azure_storage_blob

[Copilot]

Pull request overview

This PR updates the Azure Storage Blob SDK to align with the latest TypeSpec definitions from azure-rest-api-specs. The primary changes involve renaming parameters for clarity and updating immutability policy-related APIs.

Key changes:

• Renamed content_length/blob_content_length parameters to size in PageBlobClient's create() and resize() methods for better clarity
• Consolidated BlobImmutabilityPolicyMode into ImmutabilityPolicyMode with updated serialization format (lowercase) and added Mutable variant
• Updated immutability policy APIs: made expiry a required parameter in set_immutability_policy() and simplified return types to Response<(), NoFormat> for several blob operations

Reviewed changes

Copilot reviewed 4 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sdk/storage/azure_storage_blob/tsp-location.yaml	Updated commit hash reference to latest TypeSpec definitions
sdk/storage/azure_storage_blob/src/models/mod.rs	Removed exports for deleted immutability policy result types and headers
sdk/storage/azure_storage_blob/src/generated/models/pub_models.rs	Changed BlobImmutabilityPolicyMode to ImmutabilityPolicyMode and removed obsolete result structs
sdk/storage/azure_storage_blob/src/generated/models/method_options.rs	Removed immutability_policy_expiry from options (now a required parameter)
sdk/storage/azure_storage_blob/src/generated/models/header_traits.rs	Removed header traits for deleted result types and updated references to ImmutabilityPolicyMode
sdk/storage/azure_storage_blob/src/generated/models/enums_serde.rs	Removed serialization code for BlobImmutabilityPolicyMode
sdk/storage/azure_storage_blob/src/generated/models/enums_impl.rs	Removed implementation for BlobImmutabilityPolicyMode and updated ImmutabilityPolicyMode with lowercase serialization and Mutable variant
sdk/storage/azure_storage_blob/src/generated/models/enums.rs	Removed BlobImmutabilityPolicyMode enum and updated ImmutabilityPolicyMode with Mutable variant
sdk/storage/azure_storage_blob/src/generated/clients/page_blob_client.rs	Renamed blob_content_length parameter to size in create() and resize() methods
sdk/storage/azure_storage_blob/src/generated/clients/blob_client.rs	Updated immutability policy methods: made expiry required, changed return types to Response<(), NoFormat>, removed documentation for deleted header traits
sdk/storage/azure_storage_blob/src/clients/page_blob_client.rs	Updated public wrapper to use size parameter name in create() method
sdk/storage/azure_storage_blob/CHANGELOG.md	Added entry for create() parameter rename (incomplete - missing several breaking changes)

[Copilot]

Duplicate "### Breaking Changes" section header. There are two "### Breaking Changes" sections at lines 11 and 17. These should be merged into a single section.

Suggested change

	### Breaking Changes

[Copilot]

The CHANGELOG entry only mentions the create() method, but the resize() method also had its parameter renamed from blob_content_length to size. The entry should be updated to reflect both methods, e.g., "Renamed content_length to size for PageBlobClient's create() method and blob_content_length to size for PageBlobClient's resize() method."

Suggested change

	- Renamed `content_length` to `size` for `PageBlobClient`'s `create()` method.
	- Renamed `content_length` to `size` for `PageBlobClient`'s `create()` method and `blob_content_length` to `size` for `PageBlobClient`'s `resize()` method.

[Copilot]

Missing CHANGELOG entries for significant breaking changes to immutability policy APIs. The following breaking changes should be documented:

1. Renamed BlobImmutabilityPolicyMode enum to ImmutabilityPolicyMode
2. Changed string serialization format for ImmutabilityPolicyMode from PascalCase ("Locked", "Unlocked") to lowercase ("locked", "unlocked", "mutable")
3. Added Mutable variant to ImmutabilityPolicyMode enum
4. Changed BlobClient::set_immutability_policy() method signature to require expiry parameter (previously optional in options)
5. Changed return type from Response<BlobClientSetImmutabilityPolicyResult, NoFormat> to Response<(), NoFormat> for set_immutability_policy()
6. Changed return type from Response<BlobClientDeleteImmutabilityPolicyResult, NoFormat> to Response<(), NoFormat> for delete_immutability_policy()
7. Changed return type from Response<BlobClientUndeleteResult, NoFormat> to Response<(), NoFormat> for undelete()
8. Removed result header traits: BlobClientDeleteImmutabilityPolicyResultHeaders, BlobClientSetImmutabilityPolicyResultHeaders, and BlobClientUndeleteResultHeaders

Suggested change

	- Renamed `BlobImmutabilityPolicyMode` enum to `ImmutabilityPolicyMode`.
	- Changed string serialization format for `ImmutabilityPolicyMode` from PascalCase ("Locked", "Unlocked") to lowercase ("locked", "unlocked", "mutable").
	- Added `Mutable` variant to `ImmutabilityPolicyMode` enum.
	- Changed `BlobClient::set_immutability_policy()` method signature to require `expiry` parameter (previously optional in options).
	- Changed return type from `Response<BlobClientSetImmutabilityPolicyResult, NoFormat>` to `Response<(), NoFormat>` for `set_immutability_policy()`.
	- Changed return type from `Response<BlobClientDeleteImmutabilityPolicyResult, NoFormat>` to `Response<(), NoFormat>` for `delete_immutability_policy()`.
	- Changed return type from `Response<BlobClientUndeleteResult, NoFormat>` to `Response<(), NoFormat>` for `undelete()`.
	- Removed result header traits: `BlobClientDeleteImmutabilityPolicyResultHeaders`, `BlobClientSetImmutabilityPolicyResultHeaders`, and `BlobClientUndeleteResultHeaders`.