feat: Allow external links on Applications (#3487)

[keithchong]

Signed-off-by: Keith Chong kykchong@redhat.com

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This adds to the existing support, #3487, by supporting the external link annotation that has been added to Application CRs

Specifically, a user was using Application Sets to generate Applications annotated with the external-link annotation, but they do not show up in the UI. This PR addresses this issue.

[keithchong]

Link on application only, no links on child resources

Link on application, and links on child resources

Multiple links, Applications Tile view

Multiple links, Applications List view

[codecov]

Codecov Report

Merging #8231 (b2dacce) into master (dc24d05) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8231   +/-   ##
=======================================
  Coverage   41.61%   41.61%           
=======================================
  Files         174      174           
  Lines       22717    22725    +8     
=======================================
+ Hits         9453     9458    +5     
- Misses      11908    11910    +2     
- Partials     1356     1357    +1     

Impacted Files	Coverage Δ
controller/sync.go	56.96% <0.00%> (-0.55%)	⬇️
util/settings/settings.go	47.14% <0.00%> (+0.12%)	⬆️
util/argo/diff/normalize.go	44.00% <0.00%> (+4.86%)	⬆️

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[alexmt]

Looks good. Thank you!