kvserver: don't apply quota pool to lease requests

[erikgrinaker]

Lease requests and transfers are latency sensitive and small, so we allow them to bypass the quota pool. This is particularly important for expiration lease extensions, which happen every 3 seconds.

During TPCC imports, the quota pool was often found to delay lease requests by as much as 3 seconds.

Resolves #98124.

Epic: none
Release note: None

[blathers-crl]

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[cockroach-teamcity]

This change is 

[erikgrinaker]

Ran a TPCC import with this, and didn't see any lease requests take much more than a second end-to-end except for reproposals during leader changes (#104024). Previously, I often saw delays of 3 seconds or more, sufficient for the range to lose its lease. So this seems fairly effective.

[erikgrinaker]

bors r+

[erikgrinaker]

@irfansharif We'll want to do something similar with replication AC, and let lease requests through as soon as possible. Can you add that to #98308 or a follow-up PR? I'm not sure how relevant it is, since lease requests are often sent directly to the replica and bypass a lot of the store AC and such (lease transfers still go via the store though).

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)

[irfansharif]

I'm not sure how relevant it is, since lease requests are often sent directly to the replica and bypass a lot of the store AC and such (lease transfers still go via the store though).

Still relevant. Added to #104154.