added multiselect and add items to collection in admin

[vipulnarang95]

Description

Feature added:
Add items to collection action added for all moderated models in cms_config

Related resources

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Checklist

• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines

[vipulnarang95]

@fsbraun Please check and review

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.05%. Comparing base (79aaae4) to head (9318fc5).
Report is 58 commits behind head on master.

Files	Patch %	Lines
djangocms_moderation/cms_config.py	90.00%	0 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (79aaae4) and HEAD (9318fc5). Click for more details.

HEAD has 2 uploads less than BASE

| Flag | BASE (79aaae4) | HEAD (9318fc5) | |------|------|------| ||12|10|

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
- Coverage   84.19%   79.05%   -5.15%     
==========================================
  Files          23       40      +17     
  Lines        1740     1862     +122     
  Branches      282      260      -22     
==========================================
+ Hits         1465     1472       +7     
- Misses        245      359     +114     
- Partials       30       31       +1     

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[fsbraun]

Looks good. Can you add some tests? What happens if there are published, unpublished or archived objects selected when the action is run?

[fsbraun]

Actually, this is a nice example of the power of cms_config.

[vipulnarang95]

@fsbraun Tests are already there: https://github.com/django-cms/djangocms-moderation/blob/master/tests/test_forms.py#L146
Do you want me to add some specific?

[fsbraun]

Test adding a mixture of objects with different version states. I would expect a user message that some items could not be added to the collection since they are not drafts, or are locked.

Also, the test should not use the form directly, but add_items_to_collection instead.