Merge pull request cockroachdb#64473 from jbowens/backport21.1-64385

release-21.1: pkg/storage: sync file in SafeWriteToFile

Merge pull request cockroachdb#64599 from itsbilal/bump-pebble-20.2

[release-20.2] vendor: Bump pebble to ce69122e2ef3495e7e142438b90b6189710c339b

Merge pull request cockroachdb#64568 from nvanbenschoten/backport20.1…

…-56860

release-20.1: kv: improve Raft scheduler behavior under CPU starvation

clusterversion: mint 21.1 cluster version

Release note: None

Merge pull request cockroachdb#64219 from yuzefovich/backport21.1-63772

release-21.1: colflow: cancel flow on ungraceful stream shutdown in outbox

Merge pull request cockroachdb#64044 from dt/backport21.1-64023

release-21.1: sql: use read ts as batch ts to send index backfill SSTs

Merge pull request cockroachdb#63475 from tbg/backport20.1-63302

release-20.1: raftentry: fix accidental no-op in truncateFrom

Merge pull request cockroachdb#63765 from pbardea/manual-backport-jobs

release-20.2: backupccl: cluster restore import and restore jobs as canceled

changefeed: detect regional by row changes in kv_feed

This isn't strictly necessary as the schemafeed currently fails with
an unretriable error if it fails to validate the table descriptor and
regional by row tables will fail to validate.

However, it might be useful in general to be able to detect
unsupported schema migrations at this location since other schema
changes that we might want to disallow will not necessarily force a
table descriptor validation failure.

Release note: None

Merge pull request cockroachdb#63303 from pbardea/backport20.1-62572

release-20.1: backupccl: only backup public indexes