Update to fractal v2

[jluethi]

Update the helper tasks to Fractal V2

Remove the metadata changing task (as it's made obsolete in Fractal V2).

General cleanup

[codecov]

Codecov Report

Attention: Patch coverage is 72.97297% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 88.88%. Comparing base (b634753) to head (1c059c7).

Files	Patch %	Lines
tests/test_valid_args_schemas.py	65.51%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main       #7       +/-   ##
============================================
- Coverage   100.00%   88.88%   -11.12%     
============================================
  Files            5        4        -1     
  Lines           99       90        -9     
============================================
- Hits            99       80       -19     
- Misses           0       10       +10     

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