Feature Description

Currently, all e2e tests run by prow have a hardcoded set of feature gates that are being used for all tests:

Testing features that depend on particular kcp version is then not possible.

Proposed Solution

• Define an environment variable TEST_FEATURE_GATES in relevant places (Makefile, hack/run-e2e-tests.sh).
  • Default it to the value currently used.
• Put an env var placeholder into hack/ci/testdata/kustomization.yaml instead of the hardcoded value.
  • run-e2e-tests.sh will envsubst it
• Define appropriate values in our prow definition.

Alternative Solutions

No response

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Additional Context

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