[MPG] migration from swagger to TSP (track in long term)

[msyyc]

Eng

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1. [Pipeline] enable Mgmt SDK generation from Typespec directly azure-sdk-for-python#34496
   EngSys +1
   
2. [changelog][code_report] support to generate code report for DPG model azure-sdk-for-python#34497
   Mgmt Mgmt-EngSys +2
   
3. [auto release] support generate PR from typespec azure-sdk-for-python#35136
   Mgmt Mgmt-EngSys +2
   
4. [release helper] support SDK generation from typespec azure-sdk-for-python#35182
   Mgmt Mgmt-EngSys +2
   
5. [pipeline] remove existing generated files before regeneration azure-sdk-for-python#35779
   Mgmt +1
   
6. [SDK Automation - Python] Support the release from TypeSpec in MPG azure-sdk-tools#8416
   Automation Tool +1
   

Feature

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1. [MPG] Generate diff of generated SDK between swagger and typespec #2312
   discussion mgmt +2
   
2. [MPG] Backward compat access to "properties" flattening (basic scenario) #2187
   mgmt p0 +2
   
3. disable model flatten for non-GAed service azure-sdk-for-python#33822
   Mgmt +1
   
4. Fields marked with "read" visibility in TypeSpec for mgmt plane entities are not read-only in generated code #2405
   mgmt +1
   
5. support naming optimization for snake case #2636
   feature-request +1