chore: Upgrade to controller-runtime 1.15

[ellistarn]

Issue #, if available:

Description of changes:

Upgrade to controller-runtime 1.15 for kubernetes-sigs/controller-runtime#2116, which will help with startup latency when operators like Crossplane are installed.

❯ make test
/Users/etarn/go/bin/controller-gen object:headerFile="scripts/templates/boilerplate.go.txt" paths="./..."
go fmt ./...
go vet ./...
/Users/etarn/go/bin/controller-gen "crd:trivialVersions=true" rbac:roleName=controller-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases
go test ./pkg/... ./controllers/... ./webhooks/... -coverprofile cover.out
?   	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/api	[no test files]
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/aws/ec2	0.381s	coverage: 85.2% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/aws/ec2/api	0.710s	coverage: 43.6% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/aws/vpc	0.891s	coverage: [no statements]
?   	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/provider	[no test files]
?   	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/version	[no test files]
?   	github.com/aws/amazon-vpc-resource-controller-k8s/controllers/custom	[no test files]
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/condition	22.914s	coverage: 63.3% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/config	0.362s	coverage: 87.5% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/handler	1.191s	coverage: 69.0% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/healthz	15.373s	coverage: 57.1% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/k8s	1.853s	coverage: 57.4% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/k8s/pod	1.717s	coverage: 53.5% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/node	1.654s	coverage: 91.5% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/node/manager	1.001s	coverage: 84.5% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/pool	1.188s	coverage: 96.3% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/provider/branch	0.928s	coverage: 56.4% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/provider/branch/trunk	0.735s	coverage: 88.3% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/provider/ip	0.866s	coverage: 50.3% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/provider/ip/eni	0.656s	coverage: 92.9% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/resource	0.656s	coverage: 72.2% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/utils	6.043s	coverage: 78.9% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/pkg/worker	0.930s	coverage: 81.5% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/controllers/apps	0.573s	coverage: 78.6% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/controllers/core	15.767s	coverage: 68.2% of statements
ok  	github.com/aws/amazon-vpc-resource-controller-k8s/webhooks/core	0.376s	coverage: 83.0% of statements

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[jdn5126]

Compilation changes look good, but we definitely want some targeted integration test runs in this area. @haouc what is the best way to go about this?

[ellistarn]

Closing in favor of handing off to @jaydeokar #286