feat: prune last

[mayzhang2000]

fixes: #5080.
If sync option has PruneLast=true, or individual resource has annotation argocd.argoproj.io/sync-options: PruneLast=true, these prune tasks get assigned with a new sync wave.

the new sync wave is the last sync wave of non-prune tasks which is in sync phase + 1, so that these resources will be pruned after all sync phase resources are synced and healthy.

Signed-off-by: May Zhang may_zhang@intuit.com

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  fixes: Allow resource pruning to be an implicit final wave of a sync operation #5080.
  If sync option has PruneLast=true, or individual resource has annotation argocd.argoproj.io/sync-options: PruneLast=true, these prune tasks get assigned with a new sync wave.

the new sync wave is the last sync wave of non-prune tasks which is in sync phase + 1, so that these resources will be pruned after all sync phase resources are synced and healthy.

[alexmt]

Please run go mod tidy so that CI pass

[codecov-io]

Codecov Report

Merging #5199 (5321481) into master (eb9216f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5199   +/-   ##
=======================================
  Coverage   40.68%   40.68%           
=======================================
  Files         136      136           
  Lines       18420    18420           
=======================================
  Hits         7494     7494           
  Misses       9854     9854           
  Partials     1072     1072           

Impacted Files	Coverage Δ
controller/sync.go	67.47% <ø> (ø)

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