fix(bump): don't fail if an invalid version tag is present (fix #1410)

[noirbizarre]

Description

Fix a regression introduced in the 4.4.0 by #1297: bump command is failing when an invalid tag is present and not listed in ignored_tags while it was just warning about before.

This PR restores this behavior (bump will work if an invalid tag is present, but a warning will be emitted).

The error/warning message is now the same whatever the place it is triggered.

Checklist

• I have read the contributing guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained restored
  • Document any manual testing steps performed
• Update the documentation for the changes (N/A)

Documentation Changes

• Run poetry doc locally to ensure the documentation pages renders correctly (N/A)

Expected Behavior

Cf. #1410

Steps to Test This Pull Request

Cf. #1410

Additional Context

Supersedes and closes #1410

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.57%. Comparing base (120d514) to head (82f013c).
Report is 609 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1418      +/-   ##
==========================================
+ Coverage   97.33%   97.57%   +0.23%     
==========================================
  Files          42       57      +15     
  Lines        2104     2682     +578     
==========================================
+ Hits         2048     2617     +569     
- Misses         56       65       +9     

Flag	Coverage Δ
unittests	97.57% <100.00%> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.