Allow searching for a user in avo api key role resource

[segiddins]

Otherwise, the page hangs while trying to load every single user

[codecov]

Codecov Report

Merging #4000 (f52fc2d) into master (c65cb14) will decrease coverage by 0.14%.
Report is 2 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head f52fc2d differs from pull request most recent head bed1866. Consider uploading reports for the commit bed1866 to get more accurate results

@@            Coverage Diff             @@
##           master    #4000      +/-   ##
==========================================
- Coverage   98.92%   98.78%   -0.14%     
==========================================
  Files         260      260              
  Lines        6026     6027       +1     
==========================================
- Hits         5961     5954       -7     
- Misses         65       73       +8     

Files Changed	Coverage Δ
app/avo/resources/oidc_api_key_role_resource.rb	100.00% <100.00%> (ø)
app/avo/resources/user_resource.rb	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes