Cherry-pick: Add OCP-specific flag to CreateRemoteSecret, Allow set multicluster flag with env to release-1.27

[unsortedhashsets]

Cherry-picks the following commits from main to release-1.27:

• e17bcfc: Add OCP-specific flag to CreateRemoteSecret (Add OCP-specific flag to CreateRemoteSecret #1213)
  Use the '--create-service-account=false' flag when creating remote secrets on OpenShift.

• eebb1d5: Allow set multicluster flag with env (Allow set multicluster flag with env #1212)
  This change allows setting the multicluster flag via environment variables.

[istio-testing]

Hi @unsortedhashsets. Thanks for your PR.

I'm waiting for a istio-ecosystem or istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Details

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.42%. Comparing base (16ec758) to head (8d04d81).
⚠️ Report is 1 commits behind head on release-1.27.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.27    #1215      +/-   ##
================================================
- Coverage         77.74%   77.42%   -0.32%     
================================================
  Files                44       44              
  Lines              2817     2817              
================================================
- Hits               2190     2181       -9     
- Misses              521      528       +7     
- Partials            106      108       +2     

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[fjglira]

/ok-to-test