Update storage to latest tsp

[jhendrixMSFT]

Removed test for pub(crate) items as we now have dedicated tests for that scenario.

[Copilot]

Pull request overview

This pull request updates the Azure Blob Storage TypeSpec definitions and regenerates Rust code for the latest API version. The changes include updating to API version 2026-04-06, adding new error codes, converting several unions to enums, and restructuring client initialization patterns. The PR also removes tests for pub(crate) items as mentioned in the description.

Changes:

• Updated API versions from 2025-01-05 to 2026-04-06
• Converted extensible unions to non-extensible enums for many types
• Added comprehensive StorageErrorCode enum with 100+ error codes
• Renamed models (e.g., BlobItemInternal → BlobItem, StorageError → Error)
• Changed client initialization from explicit constructors to customizeCode pattern
• Updated response headers and removed many date response headers
• Added new SKU types and versioned fields with @added decorators

Reviewed changes

Copilot reviewed 6 out of 21 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
models.tsp	Added StorageErrorCode union, new SKU types, updated model names and XML names
main.tsp	Updated service versions to 2025-11-05, 2026-02-06, 2026-04-06
client.tsp	Changed from explicit client initialization to customizeCode pattern, added scope exclusions
testing.rs	Updated model references from BlobItemInternal to BlobItem, ListBlobsFlatSegmentResponse to ListBlobsResponse
lib.rs	Removed pub(crate) test touching code
xml_helpers.rs	Removed unused XML helper structs
models_serde.rs	Removed ParquetConfiguration serialization
models_impl.rs	Removed Page impl for ListBlobsHierarchySegmentResponse, removed TryFrom impls for unused types
models.rs	Renamed models, added StorageErrorCode enum, removed query-related models
enums_serde.rs	Added/updated enum serialization for new types
enums.rs	Changed many extensible unions to non-extensible enums, added StorageErrorCode variants
*_client.rs	Removed explicit constructors, updated API version to 2026-04-06, changed method signatures

[heaths]

Namespace stayed put, so that seems to be the main thing here w.r.t. #877