feat: Add RolloutCompleted condition

[khhirani]

Closes #352

[jessesuen]

I don't see any tests. Can you add a unit test for this as well as enhance the e2e test you added earlier for this?

[codecov]

Codecov Report

Merging #1074 (8174791) into master (0f131a7) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1074      +/-   ##
==========================================
+ Coverage   81.22%   81.24%   +0.01%     
==========================================
  Files         103      103              
  Lines        9252     9261       +9     
==========================================
+ Hits         7515     7524       +9     
  Misses       1235     1235              
  Partials      502      502              

Impacted Files	Coverage Δ
utils/conditions/conditions.go	78.72% <ø> (ø)
rollout/sync.go	75.25% <100.00%> (+0.47%)	⬆️

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
4.5% Duplication