feat: Expose validation webhook warnings in Argo CD UI

[Mattes83]

This is a follow up of #493

I tried to implement the proposals of @crenshaw-dev

What do you think?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (a00ce82) 54.60% compared to head (40e9453) 54.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #545      +/-   ##
==========================================
- Coverage   54.60%   54.40%   -0.20%     
==========================================
  Files          41       41              
  Lines        4641     4661      +20     
==========================================
+ Hits         2534     2536       +2     
- Misses       1911     1927      +16     
- Partials      196      198       +2     

Files	Coverage Δ
pkg/sync/common/types.go	50.00% <0.00%> (-4.17%)	⬇️
pkg/sync/sync_context.go	72.83% <20.00%> (-1.25%)	⬇️

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[cenk1cenk2]

This would be a great addition when using with operators that return some actual warnings.