Remove manual workflow step for old snapshot commands availability

[dlachaume]

Content

This PR includes a fix for the manual workflow Mithril Client multi-platform test that removes command compatibility steps due to the removal of the snapshot command.

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
  • No clippy warnings in the CI
  • 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)

[jpraynaud]

LGTM 👍

[github-actions]

Test Results

    3 files  ±0     43 suites  ±0   8m 45s ⏱️ +18s
1 012 tests ±0  1 012 ✅ ±0  0 💤 ±0  0 ❌ ±0 
1 110 runs  ±0  1 110 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit d0876fb. ± Comparison against base commit 665621d.