Make webhooks work in AKS CCP context

[matthchr]

Description This requires quite a bit of hacking, mostly overriding certain things in the ctx. The major items are:

• Copy and modify knative/pkg/webhook/resourcesemantics/conversion to support CRD clientConfig.url in addition to clientConfig.service.
• Copy and modify karpenter/pkg/webhooks/webhooks.go to support overriding the informer factory, so that we can point it at the CCP APIServer rather than overlay.
• Override Start and supporting methods on the provider specific operator in pkg/operator/operator.go to allow invoking our modified version of karpenter/pkg/webhooks/webhooks.go.

How was this change tested?

• Manually in AKS standalone.

Does this change impact docs?

• [ ] Yes, PR includes docs updates
• [ ] Yes, issue opened: #
• [x] No

Release Note

[coveralls]

Pull Request Test Coverage Report for Build 11485021484

Details

• 396 of 437 (90.62%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.08%) to 97.566%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/alt/knative/pkg/webhook/resourcesemantics/conversion/reconciler.go	49	52	94.23%
pkg/alt/knative/pkg/webhook/resourcesemantics/conversion/conversion.go	131	135	97.04%
pkg/alt/knative/pkg/webhook/resourcesemantics/conversion/controller.go	50	55	90.91%
pkg/alt/knative/pkg/webhook/resourcesemantics/conversion/internal/zz_generated.deepcopy.go	62	74	83.78%
pkg/alt/knative/pkg/webhook/resourcesemantics/conversion/internal/types.go	92	109	84.4%
<!--	Total:	396	437	90.62%	-->

Totals
Change from base Build 11454836497:	-0.08%
Covered Lines:	36961
Relevant Lines:	37883

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💛 - Coveralls