tests(systemtags): Add cypress e2e tests for systemtags admin settings

[susnux]

Summary

At least take the tests from #41515 for the now merged PR #41335

1. Enable eslint (why it was disabled?)
2. Set primary color on primary action
3. Add cypress tests

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)