chore: pin dependency versions across projects and add stale issue management workflow

[Harmanpreet-Microsoft]

Purpose

This pull request introduces several dependency updates across backend and processor Python projects, as well as the frontend requirements, to pin versions for improved stability and compatibility. Additionally, it adds a new GitHub Actions workflow to automate stale issue/PR management and branch cleanup. These changes help ensure consistent environments and maintain a cleaner repository.

Dependency Version Pinning

• Updated all dependencies in src/backend-api/pyproject.toml to use exact version numbers instead of minimum versions, ensuring consistent builds and reducing the risk of unexpected incompatibilities.
• Updated all dependencies in src/processor/pyproject.toml to use pinned versions, including upgrades and downgrades for several packages to match tested configurations.
• Updated src/frontend/requirements.txt to pin all dependencies to specific versions for frontend stability.

Repository Maintenance Automation

• Added a new workflow .github/workflows/stale-bot.yml to automatically mark and close stale issues and PRs, and generate reports for inactive and merged branches to facilitate repository cleanup.
• ...

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information

[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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