Use label in WorkChainSelector

[superstar54]

Related to #455 .

This PR avoids loading nodes in the WorkChainSelecter.

On my computer, there are 81 QeAppWorkChain processes.

Time to refresh the WorkChainSelecter

Old	This PR
19 s	0.15 s

Time to load QeApp

Old	This PR
22 s	7 s

[codecov]

Codecov Report

Patch coverage: 23.52% and project coverage change: +0.07% 🎉

Comparison is base (b4b5a72) 63.65% compared to head (d146f30) 63.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #473      +/-   ##
==========================================
+ Coverage   63.65%   63.73%   +0.07%     
==========================================
  Files          40       40              
  Lines        2710     2702       -8     
==========================================
- Hits         1725     1722       -3     
+ Misses        985      980       -5     

Flag	Coverage Δ
python-3.10	63.73% <23.52%> (+0.07%)	⬆️
python-3.8	63.77% <23.52%> (+0.07%)	⬆️
python-3.9	63.77% <23.52%> (+0.07%)	⬆️

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

Files Changed	Coverage Δ
src/aiidalab_qe/app/submission/__init__.py	73.12% <7.69%> (-3.55%)	⬇️
src/aiidalab_qe/common/process.py	81.53% <75.00%> (+15.25%)	⬆️

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[unkcpz]

Fantastic, it is clever to move the label generator to submission. Looks all good to me. Thanks!