[WIP] Race Condition where controller marks provisioned

[alimaazamat]

What this PR does / why we need it:
The controller returned ctrl.Result{} (no requeue) too early.
The test expects a requeue ctrl.Result{RequeueAfter: ...} until the provisioning duration has finished.

If res is equal to 0 then reconciliation will not be requeued, but it should be requeued and equal to 0.
if now < until then res != 0 and we requeue
if now >= until then res == 0 and we do not requeue (provisioned)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #12301

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[alimaazamat]

test result of d290d64:

I0625 07:08:03.191676   34585 inmemorymachine_backend.go:672] APIServer check: start=2025-06-25 07:08:00.844856 -0700 PDT m=+4.659283959, now=2025-06-25 07:08:03.191632 -0700 PDT m=+7.006113626, provisioningDuration=2s, until=2025-06-25 07:08:02.844856 -0700 PDT m=+6.659283959
I0625 07:08:03.201794   34585 mux.go:406] "APIServer instance added to workloadClusterListener" listenerName="foo" address="https://127.0.0.1:21100" podName="kube-apiserver-bar"
I0625 07:08:03.235570   34585 mux.go:494] "WorkloadClusterListener successfully started" listenerName="foo" address="https://127.0.0.1:21100"
--- FAIL: TestReconcileNormalApiServer (2.39s)
    --- FAIL: TestReconcileNormalApiServer/create_pod_if_Node_is_ready (2.39s)
        inmemorymachine_controller_test.go:626: 
            Expected
                <bool>: true
            to be false
FAIL
FAIL    sigs.k8s.io/cluster-api/test/infrastructure/docker/internal/controllers/backends/inmemory     7.717s
FAIL