chore: fix flaky TestAbortRolloutAfterFailedExperiment test

[alexmt]

Signed-off-by: Alexander Matyushentsev [email protected]

PR fixes flackiness in TestAbortRolloutAfterFailedExperiment introduced by #1654

go test -run TestAbortRolloutAfterFailedExperiment github.com/argoproj/argo-rollouts/rollout  -count 100
ok  	github.com/argoproj/argo-rollouts/rollout	21.187s

[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

Merging #1710 (80e45f8) into master (b3d50d1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1710   +/-   ##
=======================================
  Coverage   82.06%   82.06%           
=======================================
  Files         116      116           
  Lines       16075    16075           
=======================================
  Hits        13192    13192           
  Misses       2210     2210           
  Partials      673      673           

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