AV-2320: Fix opendata-group add CLI command

[bzar]

• Adding users to groups now requires username in context even with ignore_auth

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 26.86%. Comparing base (fe51042) to head (ee13bf0).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
ckan/ckanext/ckanext-ytp_main/ckanext/ytp/cli.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2405      +/-   ##
==========================================
- Coverage   26.87%   26.86%   -0.01%     
==========================================
  Files          42       42              
  Lines        5921     5922       +1     
  Branches       37       37              
==========================================
  Hits         1591     1591              
- Misses       4330     4331       +1     

Flag	Coverage Δ
cdk	92.02% <ø> (ø)
ckan	21.64% <0.00%> (-0.01%)	⬇️

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[cypress]

opendata    Run #5101

Run Properties:   Passed #5101  •  ff64011751 ℹ️: Merge ee13bf09c5d8ea0fea2cc7cf108f785e8a14aa57 into d6076b85fa249ac941f3d0b1ba48...

Project	opendata
Branch Review	AV-2320_add-all-users-to-new-groups
Run status	Passed #5101
Run duration	04m 19s
Commit	ff64011751 ℹ️: Merge ee13bf09c5d8ea0fea2cc7cf108f785e8a14aa57 into d6076b85fa249ac941f3d0b1ba48...
Committer	Teemu Erkkola
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	1
Pending	3
Skipped	0
Passing	85
View all changes introduced in this branch ↗︎