staging-v24.3.13: admission: incorporate higher compaction rate during WAL failover

[blathers-crl]

Backport 1/1 commits from #145921 on behalf of @blathers-crl[bot].

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Backport 1/1 commits from #138708 on behalf of @sumeerbhola.

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WAL failover can happen even when the throughput sustainable by the primary
is high (since we tune WAL failover to happen at a 100ms latency threshold).
So if the workload increase is resulting in more compactions, we should
incorporate that into the tokens given out by the ioLoadListener.

Informs #138655

Epic: none

Release note: None

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Release justification: Addresses insufficient tokens under high write load and WAL failover.

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Release justification:

[blathers-crl]

Thanks for opening a backport.

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[cockroach-teamcity]

This change is