add `InitialCooldownPeriod` for ScaledObjects #9490

Job	Run time
Static Checks	4m 46s
validate - arm64	7m 38s
validate - amd64	12m 17s
Validate dev-container - arm64	11s
validate-dockerfiles - arm64	11s
Validate dev-container - amd64	45s
validate-dockerfiles - amd64	42s
trivy-scan / Trivy - ubuntu-latest - fs	52s
	27m 22s

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