🐛 Allow AWSMachine instance creation when control-plane LB is disabled

[arno-pons]

What type of PR is this?

/kind bug

What this PR does / why we need it:

When AWSCluster.spec.controlPlaneLoadBalancer.loadBalancerType is set to disabled, the AWSCluster controller correctly delegates endpoint management to the user and waits for spec.controlPlaneEndpoint to be populated externally.

However, the AWSMachine instance creation code still blocked on status.network.apiServerELB.dnsName being non-empty, which is never populated when the LB is disabled. This caused all control-plane machine creation to fail with:

"failed to run controlplane, APIServer ELB not available"

Add IsControlPlaneLBDisabled() to MachineScope and include it in the ELB availability guard so that instance creation proceeds when the user has opted out of CAPA-managed load balancing and provided their own spec.controlPlaneEndpoint.

AI Usage:

Copilot usage to fix the issue.

Fixes #6017

Special notes for your reviewer:

None

Checklist:

• squashed commits
• includes documentation
• includes AI generated content
• includes emoji in title
• adds unit tests
• adds or updates e2e tests

Release note:

NONE

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