fix flaky test TestInformedWatcher

[runzexia]

Signed-off-by: runzexia root@junwuhui.cn
ref #1907

[knative-prow-robot]

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[codecov]

Codecov Report

Merging #1908 (2d29075) into master (615f17a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1908   +/-   ##
=======================================
  Coverage   69.42%   69.42%           
=======================================
  Files         207      207           
  Lines        8739     8739           
=======================================
  Hits         6067     6067           
  Misses       2402     2402           
  Partials      270      270           

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[dprotaso]

Oh sorry @runzexia I didn't see this PR - my apologies

[runzexia]

no problem😁