E2E Test with simple-pbt

[Test] Refactor `inject_webhook_test.go` according to the Developer Guide #891

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Run time

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Job	Run time
e2e (v1.27.11, simple-pbt)	6m 58s
e2e (v1.28.7, simple-pbt)	6m 10s
e2e (v1.29.2, simple-pbt)	6m 41s
	19m 49s