Follow up items after adoption SCM 1.1.0-beta.3

[m-nash]

Bug fixes

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1. Enable the new cancellation token pattern in the debranded generator #4243
   CodeGen v3 +2
   
2. [ClientModel-based clients] Move message.Apply(options) call to end of request-creation method #4484
   CodeGen v3 +2
   
3. [ClientModel-based clients] Rename context parameter name in protocol methods to options #4482
   CodeGen v3 +2
   
4. [ClientModel-based clients] Update ClientPipelineExtensions to use ClientModel patterns #4485
   CodeGen v3 +2
   
5. [ClientModel-based clients] Remove remaining "Azure" references from unbranded clients. #4481
   +0
   
6. [ClientModel-based clients] Setting unreferenced-types-handling: keepAll in tspconfig.yaml results in build error #4553
   CodeGen v3 +2
   
7. [ClientModel-based clients] ClientUriBuilder does not build the path correctly #4567
   DPG DPG/RLC v2.1 v3 +3
   
8. [ClientModel-based clients] Inconsistent "credential" versus "keyCredential" in client constructors #4555
   CodeGen needs-author-feedback v3 +3
   
9. [ClientModel-based clients] Introduce back RequestContentHelper and Utf8JsonRequestContent #4571
   DPG DPG/RLC v2.1 +2
   
10. The doc comment for the ApiKeyCredential parameter in an unbranded client constructor mentions Azure #4619
    +0
    
11. [Unbranded clients] Remove null-check around message.Apply(options) #4537
    DPG DPG/RLC v2.1 +2
    
12. Generated serialization code with a custom hook via the CodeGenSerializationAttribute does not pass the ModelReaderWriterOptions parameter #4594
    +0
    
13. [ClientModel-based clients] Use factory methods for ApiKeyAuthenticationPolicy that match the TypeSpec #4489
    +0

Optimizations

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1. Codegen side implementation for multipart/form-data #4340
   DPG DPG/RLC v2.1 +2
   
2. [ClientModel-based clients] Decide if MPFD models should implement IPersistableModel #4487
   +0
3. [ClientModel-based clients] MFPD input models should use Stream type for input binary content #4488
   +0
4. [ClientModel-based clients] Update comments and method names to convert models to BinaryContent #4486
   +0
5. [ClientModel-based clients] Make request-creation helper methods private instead of internal #4483
   +0
6. [ClientModel-based clients] ClientUriBuilder does not escape special characters directly #4480
   +0
7. [ClientModel-based clients] Pattern for HEAD requests #4479
   +0
8. .NET MFD throw exception in EnsureCompleted when run test sync API with debug version SDK #4702
   DPG DPG/RLC v2.1 +2