[release-1.20] e2e tests timeout increase to 60m

[knative-prow-robot]

This is an automated cherry-pick of #424

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.30%. Comparing base (92b9854) to head (c684a73).

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.20     #425   +/-   ##
=============================================
  Coverage         22.30%   22.30%           
=============================================
  Files                32       32           
  Lines              1955     1955           
=============================================
  Hits                436      436           
  Misses             1484     1484           
  Partials             35       35           

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