feat: added image minimum and maximum gc age

[Lerentis]

fixes #16317

i hope i added these correctly. tried to follow these docs: https://github.com/kubernetes/kops/blob/master/docs/contributing/api_updates.md#adding-a-field

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• ✅ login: Lerentis / name: Tobias Trabelsi (311f402)

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[hakman]

Thanks for adding this @Lerentis. It looks good mostly.
Please use *string instead of string and re-run make apimachinery.

[hakman]

/ok-to-test

[Lerentis]

Thanks for adding this @Lerentis. It looks good mostly. Please use *string instead of string and re-run make apimachinery.

Changed and rerun the generators accordingly 😃

[hakman]

Thanks @Lerentis! 👍

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