verification code V2 - support verification code of multiple separate single character input fields

[ykeremy]

:rocket:	This description was created by Ellipsis for commit 078c1daff089462bd775838f01f428fcbee0168c

Summary:

Enhanced verification code handling by removing placeholders and adding real-time fetching, with updates across multiple files in the skyvern project.

Key points:

• Enhanced verification code handling by removing placeholders and adding real-time fetching.
• Removed VERIFICATION_CODE_PLACEHOLDER from skyvern/constants.py.
• Added handle_potential_verification_code in skyvern/forge/agent.py.
• Updated _build_navigation_payload in skyvern/forge/agent.py to include verification codes.
• Modified prompt templates in skyvern/forge/prompts/skyvern/extract-action.j2 and extract-action-claude3-sonnet.j2 to handle need_verification_code.
• Added totp_codes to SkyvernContext in skyvern/forge/sdk/core/skyvern_context.py.
• Updated skyvern/webeye/actions/handler.py to remove placeholder handling and added poll_verification_code.
• Added RESIDENTIAL_GB to ProxyLocation enum in skyvern/forge/sdk/schemas/tasks.py.

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