CI: move pylint configuration to pyproject.toml

[sphuber]

Fixes #4409

This is supported by pylint as of v2.5.

[codecov]

Codecov Report

Merging #4411 into develop will decrease coverage by 0.01%.
The diff coverage is 90.91%.

@@             Coverage Diff             @@
##           develop    #4411      +/-   ##
===========================================
- Coverage    79.22%   79.22%   -0.00%     
===========================================
  Files          475      475              
  Lines        34827    34826       -1     
===========================================
- Hits         27589    27588       -1     
  Misses        7238     7238              

Flag	Coverage Δ
#django	73.07% <77.28%> (+0.01%)	⬆️
#sqlalchemy	72.29% <77.28%> (-<0.01%)	⬇️

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

Impacted Files	Coverage Δ
...jsite/db/migrations/0015_invalidating_node_hash.py	100.00% <ø> (ø)
.../backends/djsite/db/migrations/0018_django_1_11.py	100.00% <ø> (ø)
...db/migrations/0019_migrate_builtin_calculations.py	100.00% <ø> (ø)
...s/djsite/db/migrations/0020_provenance_redesign.py	69.24% <ø> (ø)
.../0021_dbgroup_name_to_label_type_to_type_string.py	100.00% <ø> (ø)
...rations/0022_dbgroup_type_string_change_content.py	100.00% <ø> (ø)
.../migrations/0023_calc_job_option_attribute_keys.py	100.00% <ø> (ø)
...backends/djsite/db/migrations/0024_dblog_update.py	93.50% <ø> (ø)
...db/migrations/0025_move_data_within_node_module.py	100.00% <ø> (ø)
...migrations/0026_trajectory_symbols_to_attribute.py	96.00% <ø> (ø)
... and 45 more

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[greschd]

LGTM, thanks @sphuber!