ci: add support for testing a specific release in Backward compatibility workflow

[dlachaume]

Content

This PR includes support for specifying a release to test (default: unstable) in the Backward compatibility GitHub workflow. It also adds the ability to define which release is used to build the e2e binary (default: unstable).

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • CHANGELOG file is updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
  • All check jobs of the CI have succeeded
  • Self-reviewed the diff
  • Useful pull request description
  • Reviewer requested
• Documentation
  • Update README file (if relevant)
  • Update documentation website (if relevant)
  • Add dev blog post (if relevant)
  • Add ADR blog post or Dev ADR entry (if relevant)
  • No new TODOs introduced

Issue(s)

Closes #2093

[github-actions]

Test Results

    4 files  ±0    154 suites  ±0   23m 3s ⏱️ +13s
2 121 tests ±0  2 121 ✅ ±0  0 💤 ±0  0 ❌ ±0 
6 478 runs  ±0  6 478 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit c98bde1. ± Comparison against base commit b790062.

♻️ This comment has been updated with latest results.

[Alenar]

LGTM 🐢

[turmelclem]

LGTM 🦌