ci: skip unnecessary release workflow run

[shiftinv]

Summary

Followup to #1072.
The Build + Release workflow currently runs on all master/version branch commits, skipping all jobs apart from building the package (i.e. the first one).
Since the Lint + Test workflow also already goes through the same steps and ensures the package builds correctly, we don't need to do all that twice.

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)