chore: use targetNamespace for authorino feature

[cam-garrison]

Description

This PR uses TargetNamespace for the authorino feature, removing the need for the helper ResolveAuthNamespace() function.

How Has This Been Tested?

Tested on CRC with image quay.io/cgarriso/opendatahub-operator:dev-use-target-ns, created DSCI with default auth namespace and saw that authorino pod was created in targetNS opendatahub-auth-provider as expected and then specified in DSCI with namespace auth-provider to ensure specifying still works.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

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[israel-hdez]

I think a change in mesh-authz-ext-provider.patch.tmpl is missing:
https://github.com/opendatahub-io/opendatahub-operator/blob/incubation/pkg/feature/templates/servicemesh/authorino/mesh-authz-ext-provider.patch.tmpl#L12

[bartoszmajsak]

I would suggest putting this PR on hold for the time being, as I am reworking the f.Spec stuff entirely.

[openshift-merge-robot]

PR needs rebase.

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[openshift-ci]

@cam-garrison: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/opendatahub-operator-pr-image-mirror	62878eb	link	true	/test opendatahub-operator-pr-image-mirror
ci/prow/ci-index	62878eb	link	true	/test ci-index
ci/prow/opendatahub-operator-e2e	62878eb	link	true	/test opendatahub-operator-e2e
ci/prow/images	62878eb	link	true	/test images

Full PR test history. Your PR dashboard.

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