WIP: Suppress unnecessary errors for nonexistent experiments

[isimo00]

This PR aims to declutter the console text displayed when users try to perform actions on experiments that do not exist, mailny Python's tracebacks.
Closes #1046

Check List

• I have read CONTRIBUTING.md.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Applied any dependency changes to pyproject.toml.
• Tests are included (or explain why tests are not needed).
• Changelog entry included in CHANGELOG.md if this is a change that can affect users.
• Documentation updated.
• If this is a bug fix, PR should include a link to the issue (e.g. Closes #1234).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 59.83%. Comparing base (b340764) to head (af9131a).

Files with missing lines	Patch %	Lines
autosubmit/autosubmit.py	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2365      +/-   ##
==========================================
- Coverage   59.83%   59.83%   -0.01%     
==========================================
  Files          74       74              
  Lines       17435    17436       +1     
  Branches     3365     3365              
==========================================
  Hits        10432    10432              
- Misses       6137     6138       +1     
  Partials      866      866              

Flag	Coverage Δ
fast-tests	59.83% <25.00%> (-0.01%)	⬇️

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