fix: Add site agent manager for vpc peering and fix workflows

[hanyux-nv]

Description

This PR adds VPC Peering site-agent manager and fixes VPC Peering workflows to require VPC Peering ID during creation.

Type of Change

• Feature - New feature or functionality (feat:)
• Fix - Bug fixes (fix:)
• Chore - Modification or removal of existing functionality (chore:)
• Refactor - Refactoring of existing functionality (refactor:)
• Docs - Changes in documentation or OpenAPI schema (docs:)
• CI - Changes in GitHub workflows. Requires additional scrutiny (ci:)
• Version - Issuing a new release version (version:)

Services Affected

• API - API models or endpoints updated
• Workflow - Workflow service updated
• DB - DB DAOs or migrations updated
• Site Manager - Site Manager updated
• Cert Manager - Cert Manager updated
• Site Agent - Site Agent updated
• RLA - RLA service updated
• Powershelf Manager - Powershelf Manager updated
• NVSwitch Manager - NVSwitch Manager updated

Related Issues (Optional)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

Additional Notes

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