Fix release tool links and improve workflow robustness

[rickeylev]

Fixes release tool bugs and improves workflow robustness.

• Fix BCR entry link in create-rc to use RC version instead of final version.
• Format BCR entry link as 'BCR Entry '.
• Fix release workflow status link to use release_create_rc.yaml.
• Use GITHUB_RUN_ID to link directly to the workflow run if available.
• Link the branch name in the create-rc comment.
• Add a always-running job to release_create_release_branch.yaml to suppress 'no jobs ran' errors.
• Remove obsolete rocket assertions in create_rc tests.

[gemini-code-assist]

Code Review

This pull request updates the release candidate creation script to dynamically generate markdown links for the release branch, BCR entry, and GitHub Actions workflow run (using GITHUB_RUN_ID if available), and updates the corresponding unit tests. The feedback suggests addressing potential environment leakage in tests (specifically GITHUB_RUN_ID and GITHUB_OUTPUT) to prevent test failures in CI, and moving the inline import of the os module to the top of the file to comply with PEP 8 guidelines.

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