Document rationale for machine pools

[richardcase]

From wg meeting, we need to document that rationale for using MachinePools.

There is some information in the original CAEP that can be used as a starting basis.

Collaborate via Google docs or some othertmeans initially.

/area machinepool

Refers #9005

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[AndiDog]

/assign

[bnallapeta]

/assign

[ibnjunaid]

/assign

[AndiDog]

It would be great if we can start with a collaborative documents (Google Docs, hackmd or so) before putting up a PR since PRs are so much slower to work together. Do you want to start one?

[bnallapeta]

https://docs.google.com/document/d/1KxcXPqpruiekEg8ob4MMv8KKPAPtVRAzxtfOAB0kHws/edit?tab=t.0