[release-1.16] use sufficient identity roles for conformance tests

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #5060

/assign jackfrancis

NONE

[jackfrancis]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 2786cb14728466b18df73f9d10733ccbeebee188

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.13%. Comparing base (c8c0581) to head (88d0f58).
Report is 1 commits behind head on release-1.16.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.16    #5065   +/-   ##
=============================================
  Coverage         51.13%   51.13%           
=============================================
  Files               274      274           
  Lines             24658    24658           
=============================================
  Hits              12609    12609           
  Misses            11260    11260           
  Partials            789      789           

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