fix: File expand url incorrect and worked not with custom image models

[fsbraun]

Description

Fixes #1470:

fa385bd2b4b3022f54499bbb3c603d463f4baf2e removed the _view suffix from url name leading to an empty link.

Also, if the Image model is replaced by a custom model, the reverse name changes, too.

This PR moves the generation of the admin urls to the BaseImage model where the other admin urls are generated, sucha as get_admin_change_url etc.

Related resources

• fix: directory listing with svg image #1470
• #...

Checklist

• I have opened this pull request against master
• 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 and I have joined #workgroup-pr-review on
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.03%. Comparing base (0402d66) to head (4ca60a5).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1471      +/-   ##
==========================================
- Coverage   77.05%   77.03%   -0.03%     
==========================================
  Files          75       75              
  Lines        3544     3549       +5     
  Branches      508      570      +62     
==========================================
+ Hits         2731     2734       +3     
- Misses        653      654       +1     
- Partials      160      161       +1     

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[fsbraun]

@marksweb Oh dear, I fixed the typo in tox.ini.