wait for pods to appear before checking ready

[psschwei]

Changes

• 🧹 Wait for pods to be created before checking if they are ready. Fixes an issue users were reporting where kourier install was failing. Requires at least kubectl v1.34, so also adds a check in the install step for kubectl version.

/kind performance

Fixes #668

Release Note

Adds a minimum kubectl version check during the install step, in line with the minimum kubernetes version.

Docs

[knative-prow]

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