✨ Add custom path option for webhooks

[damsien]

This PR adds a way to configure mutating and validating webhooks using a custom path (for the HTTP call). It answer a problem described in this issue.

By default, the WebhookBuilder will generates the path using the generateMutatePath(gvk)/generateValidatePath(gvk) function. But if the user wants to use a custom path, it can build the WebhookBuilder using the WithCustomPath(customPath) function.

Example:

WebhookManagedBy(mgr).
	For(&TestDefaulter{}).
	WithDefaulter(&TestCustomDefaulter{}).
	WithCustomPath(customPath).
	Complete()

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: damsien / name: Damien (9cf5a86)

[k8s-ci-robot]

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[k8s-ci-robot]

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[alvaroaleman]

Idea makes a lot of sense, one comment

[alvaroaleman]

/ok-to-test

[damsien]

@alvaroaleman Done ✔️

[alvaroaleman]

This alters the path or not? Lets not do that, people might refernce the path in their Validating/MutatingWebhookConfiguration

[damsien]

@alvaroaleman if you're asking about the path.Clean() in the return section, it does not alter the final path, it only makes it cleaners. When I say it does not alter, it is in the way that the final path will act the same as the one provided by the user. For eg.

"//test" -> "/test"

So you want me to just return the customPath?