Feat/filer perm improvements

[vinitkumar]

Description

Implement some permissions related fixes for the filer.

Related resources

Refer to issue, resolves #1358

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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 Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

Merging #1361 (de071b8) into master (ed8f8a8) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1361      +/-   ##
==========================================
+ Coverage   73.25%   73.29%   +0.04%     
==========================================
  Files          73       73              
  Lines        3320     3325       +5     
  Branches      540      541       +1     
==========================================
+ Hits         2432     2437       +5     
  Misses        717      717              
  Partials      171      171              

Impacted Files	Coverage Δ
filer/admin/folderadmin.py	72.81% <100.00%> (ø)
filer/models/foldermodels.py	86.36% <100.00%> (ø)
filer/models/virtualitems.py	94.73% <100.00%> (+0.37%)	:arrow_up: