Remove V2 SDK

[NolanTrem]

Important

Remove V2 SDK from JavaScript and Python codebases, including related files and references.

• JavaScript SDK:
  • Removed models.tsx and its exports from index.ts.
  • Removed V2-specific imports and code from r2rClient.ts.
• Python SDK:
  • Removed V2 mixins from async_client.py and sync_client.py.
  • Deleted V2-related files in py/sdk/v2/ directory.
  • Updated R2RAsyncClient and R2RClient to remove V2 references.

^{This description was created by for 7427ea7. It will automatically update as commits are pushed.}

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