Prevent role deletion if no member has a different admin role

[Taucher2003]

Closes #851

[github-actions]

GitLab Pipeline Action

General information

Link to pipeline: https://gitlab.com/code0-tech/development/sagittarius/-/pipelines/2389015049

Status: Passed
Duration: 3 minutes

Job summaries

rspec: [ee]

Coverage report available at https://code0-tech.gitlab.io/-/development/sagittarius/-/jobs/13517457402/artifacts/tmp/coverage/index.html
Test summary available at https://gitlab.com/code0-tech/development/sagittarius/-/pipelines/2389015049/test_report
Finished in 20.8 seconds (files took 12.14 seconds to load)
1317 examples, 0 failures
Line Coverage: 92.55% (4249 / 4591)
[TEST PROF INFO] Time spent in factories: 00:11.239 (40.59% of total time)

rspec: [ce]

Coverage report available at https://code0-tech.gitlab.io/-/development/sagittarius/-/jobs/13517457400/artifacts/tmp/coverage/index.html
Test summary available at https://gitlab.com/code0-tech/development/sagittarius/-/pipelines/2389015049/test_report
Finished in 22.84 seconds (files took 10.91 seconds to load)
1270 examples, 0 failures
Line Coverage: 92.0% (4081 / 4436)
[TEST PROF INFO] Time spent in factories: 00:11.436 (39.24% of total time)

rubocop

727 files inspected, no offenses detected