fix(machine): propagate MaxConcurrentReconciles to drain controller

[loick111]

The drain controller was always created with default options, ignoring the MaxConcurrentReconciles value passed via caller opts. This meant platforms like Azure that set concurrent reconciles to 10 would still have the drain controller running with a single worker, creating a bottleneck during large-scale drain operations.

Propagate MaxConcurrentReconciles from the incoming opts to the drain controller options so both controllers scale equally.

Case: #04399828

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[openshift-ci]

Hi @loick111. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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