Update e2e-test script for per-feature flag test

[JeromeJu]

Changes

This commit updates the e2e test script for per feature flag test.

/kind misc

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[JeromeJu]

/retest

[JeromeJu]

cc @tektoncd/core-maintainers can I get a lgtm for this given the coming release cutoff?

[pritidesai]

There is one test file right now - https://github.com/tektoncd/pipeline/blob/main/test/per_feature_flags_test.go with this flag, I am assuming we are enabling it with this PR.

/lgtm

[JeromeJu]

There is one test file right now - https://github.com/tektoncd/pipeline/blob/main/test/per_feature_flags_test.go with this flag, I am assuming we are enabling it with this PR.

/lgtm

Yes, thanks @pritidesai , this shall work with the plumbing setup . Will keep an eye on the prow results.