🌱 Add AndiDog as machine pool area reviewer

[AndiDog]

What this PR does / why we need it:

As discussed in office hours, the machine pool area should have more contributors overall, and adding someone with a reviewer role could lead to improving this situation.

In my job, I regularly work on CAPA machine pool support, and therefore also worked on the generic parts in CAPI. Overall, there were probably more than contributed 10 PRs relating to that area. I've been a CAPA maintainer since 2024-07, reviewer since 2023-12. My work included major features such as AWSMachinePool machines support (CAPA) or MachineHealthCheck remediation support for machine pool machines (CAPI; pending review by the working group). I'm in office hours somewhat regularly and try to discuss important topics – until now particularly topics around machine pool API, contract and expected behavior (example from ~2023: how/whether to roll machine pool machines on KubeadmConfig changes). I've worked on, or looked into, the machine pool and machine controller codebase often enough to be pretty familiar.

My current goal as reviewer would be to help the working group stabilize and document the API and contract well, then later add or fix reasonable features.

[k8s-ci-robot]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[k8s-ci-robot]

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[k8s-ci-robot]

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