DAOS-18366 control: Scale dmg pool timeout with ranks (#17375)

[tanabarr]

Steps for the author:

• Commit message follows the guidelines.
• Appropriate Features or Test-tag pragmas were used.
• Appropriate Functional Test Stages were run.
• At least two positive code reviews including at least one code owner from each category referenced in the PR.
• Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions]

Ticket title is 'dmg pool reintegrate command timeouts for some ranks on MDonSSD environment. Also, noticed one rank getting excluded during the rebuild process.'
Status is 'Awaiting backport'
Labels: 'md_on_ssd,request_for_2.6.6,scrubbed_2.8'
Job should run at elevated priority (1)
https://daosio.atlassian.net/browse/DAOS-18366