[occm] Fix floating IP allocation for shared internal load balancers

[skartikey]

What this PR does / why we need it:
Fixes an issue where the OpenStack Cloud Controller Manager incorrectly attempts to allocate floating IPs when sharing internal load balancers between services. This causes spurious warnings and potential failures when using the load balancer sharing feature with internal services.

What happened:
When sharing an internal load balancer (marked with service.beta.kubernetes.io/openstack-internal-load-balancer: "true"), the controller would still try to attach a floating IP to the shared load balancer, even though internal load balancers should not have floating IPs by design.

What this PR does:

• Adds a check in ensureFloatingIP to skip floating IP operations for shared internal load balancers
• Returns the VIP address directly for internal load balancers when the service is not the load balancer owner
• Prevents unnecessary floating IP allocation attempts while preserving existing behavior for all other scenarios

Which issue this PR fixes(if applicable):
fixes #2891

Special notes for reviewers:

This change only affects the code path for services that are both internal (svcConf.internal = true) and not the load balancer owner (isLBOwner = false). All existing behavior for external load balancers and load balancer owners remains unchanged.

Release note:

NONE

[linux-foundation-easycla]

• ✅login: skartikey / (4e549dd)

The committers listed above are authorized under a signed CLA.

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[kayrus]

/ok-to-test