Refactor experiment status traceability

[ntorqulu]

Closes #282
PR to trace the experiment statuses from the database instead of pkl files. Force the db to be the first source of truth (while keeping the pkl status compatibility as a recovery approach)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.34711% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.54%. Comparing base (a57dc01) to head (4f2abba).

Files with missing lines	Patch %	Lines
autosubmit_api/bgtasks/tasks/status_updater.py	97.46%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
- Coverage   80.85%   80.54%   -0.31%     
==========================================
  Files         109      109              
  Lines        9501     9583      +82     
==========================================
+ Hits         7682     7719      +37     
- Misses       1819     1864      +45     

Flag	Coverage Δ
fast-tests	80.54% <98.34%> (-0.31%)	⬇️

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[ntorqulu]

Finished the implementation of the experiment status traceability refactor for the API.
As with the backend implementation, it will be kept as draft until the following pr's are merged into master:

• #2619: Branch with AS 4.2.0
• #2980: Branch with the experiment traceability refactor from the backend