fix(RHINENG-1423): Enable sorting by last modified

[gkarat]

Fixes https://issues.redhat.com/browse/RHINENG-1423.

Adds sorting by last modified on the groups page.

How to test

1. Go to /inventory/groups
2. Try to sort some groups by the "Last modified" column, verify that the results are correct
3. Make sure the sorting persists after page refresh

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (198049d) 59.29% compared to head (fdcd0b6) 59.26%.

Files	Patch %	Lines
src/components/GroupsTable/GroupsTable.cy.js	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2106      +/-   ##
==========================================
- Coverage   59.29%   59.26%   -0.04%     
==========================================
  Files         186      186              
  Lines        5918     5921       +3     
  Branches     1665     1665              
==========================================
  Hits         3509     3509              
- Misses       2409     2412       +3     

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[mkholjuraev]

LGTM! Sorting works as expected on last modified column.

[gkarat]

🎉 This PR is included in version 1.57.4 🎉

The release is available on GitHub release

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