✨ CRD file path on CRDInstallOptions.Paths

[knabben]

This PR enables the usage of files path on CRDInstallOptions.Paths, allowing users to register only a single CRD or an entire directory.

Next step is to bring this to Environment (maybe CRDFilePaths?).

Starts to fix #394

[k8s-ci-robot]

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[DirectXMan12]

/lgtm
/approve

awesome

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DirectXMan12, knabben

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[DirectXMan12]

Flake here: https://prow.k8s.io/view/gcs/kubernetes-jenkins/pr-logs/pull/kubernetes-sigs_controller-runtime/713/pull-controller-runtime-test/1204197535384604672

@knabben Can you take a look please?

[knabben]

This should fix, I'm avoiding using CRDs being deleted on teardown tests - #725