kvserver: skip some slow tests under race

[tbg]

These take >1m under race and are now skipped for the race build.

Note that TestLearnerSnapshotFailsRollback takes 90s even under ideal
conditions, though that is fixed once I get #75248 over the finish
line. At that point it probably wouldn't figure prominently as a
slow test, but until then it's verrrry slow (>7m, probably since
race stuff slows down the longer it runs) so still good to skip
it now.

https://cockroachlabs.slack.com/archives/C0KB9Q03D/p1646221664032729

Release justification: testing-only change
Release note: None

[cockroach-teamcity]

This change is 

[erikgrinaker]

Are these candidates for skip.UnderShort() too?

[otan]

i don't know if you want to attach an issue number to chase these up.
all kvserver tests take over 5s from a quick glance, wonder if we should just skip the suite. but i'll leave that to KV to decide :)

[erikgrinaker]

all kvserver tests take over 5s from a quick glance, wonder if we should just skip the suite. but i'll leave that to KV to decide :)

I think we definitely want to run kvserver under race. These are generally integration tests, which is where most races get exposed as we're running a bunch of concurrent components.

[otan]

Understood, I wish they were a tad more turbo ;) (it's been 2 hours on bors so I'm a little antsy)

[tbg]

bors r=erikgrinaker

Are these candidates for skip.UnderShort() too?

Probably, but I'm not sure if the -short runs get much airplay and if so what the cutoff is. Let's revisit that during stability when we think about automating the detection of some of these flakyslow tests.

[craig]

Build failed (retrying...):

• GitHub CI (Cockroach)

[tbg]

bors r=erikgrinaker

[craig]

Build succeeded:

• GitHub CI (Cockroach)