fix: Allow retrieving badges in other namespaces (#15468) [release-2.8]

[jannfis]

Cherry-pick of #15468 to release-2.8

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• Optional. My organization is added to USERS.md.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% 🎉

Comparison is base (7b89ae4) 49.95% compared to head (92a9833) 49.99%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.8   #15482      +/-   ##
===============================================
+ Coverage        49.95%   49.99%   +0.04%     
===============================================
  Files              263      263              
  Lines            45061    45087      +26     
===============================================
+ Hits             22508    22541      +33     
+ Misses           20345    20339       -6     
+ Partials          2208     2207       -1     

Files Changed	Coverage Δ
server/badge/badge.go	92.68% <100.00%> (+9.17%)	⬆️
server/server.go	55.04% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.