E2E Test with tune API

[Test] Refactor `inject_webhook_test.go` according to the Developer Guide #50

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Run time

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Job	Run time
e2e (v1.27.11)	8m 9s
e2e (v1.28.7)	6m 25s
e2e (v1.29.2)	7m 34s
	22m 8s