fix: Allow all resources to add external links

[tyrken]

Improves the phase 1 implementation of #3487 to allow adding links via annotations to all resource types, including ingresses/pods/services that previously skipped looking for annotations.

• 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).

[tyrken]

FWIW I've cherry-picked this change on top of the v2.1.7 we run locally, and it seems to work. Happy to open a second PR to copy the change to the release-2.2 branch or whatever is needed to get it in the next release...

[tyrken]

I've rebased & added another test - any chance of review or at least letting CI run @alexmt ? (Sorry don't know who else to ask - no response on CNCF slack...)

[codecov]

Codecov Report

Merging #7923 (540b2cf) into master (2f83312) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7923      +/-   ##
==========================================
- Coverage   41.53%   41.52%   -0.01%     
==========================================
  Files         174      174              
  Lines       22705    22700       -5     
==========================================
- Hits         9430     9427       -3     
+ Misses      11921    11918       -3     
- Partials     1354     1355       +1     

Impacted Files	Coverage Δ
controller/cache/info.go	65.90% <ø> (+0.13%)	⬆️
util/settings/settings.go	47.01% <0.00%> (ø)

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[jannfis]

Thanks for your PR and your patience, @tyrken - I'll take a closer look at this one ASAP.

[alexmt]

Thank you for PR @tyrken ! Change totally makes sense. LGTM.

@jannfis do you mind if I merge it?

[jannfis]

LGTM as well