Enable Gateway only CA Bundles and custom CA CM name

[aslakknutsen]

Avoid conflict with a user control plane by setting a custom CA Bundle CM name for the Gateway Control plane and enable istio to only inject CA Bundle CMs in namespaces where Gateways exist to avoid poluting the whole cluster.

Two new Env variables set for the Istio control plane deployment CR;
PILOT_CA_CERT_CONFIGMAP
PILOT_ENABLE_GATEWAY_API_CA_CERT_ONLY

Related to OSSM-9076

Requires OSSM 3.0.1 to work, but not to merge.

Depends on

• [release-1.24] OSSM-9076 Enable CA Bundle injection in only Gateway Namespaces openshift-service-mesh/istio#335 OSSM-9076
• [release-1.24] OSSM-8206 istiod ca: custom ConfigMap name for CA root cert openshift-service-mesh/istio#333 OSSM-8206

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[openshift-ci]

@aslakknutsen: all tests passed!

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[candita]

@Miciah will contact @aslakknutsen regarding this being incorporated in another PR.

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[openshift-merge-robot]

PR needs rebase.

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[aslakknutsen]

Merged via other commits. Closing.