backport-2.1: storage: delay manual splits that would result in more snapshots #33015
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Backports #32594. This didn't apply cleanly, but only because I never
cherry-picked #32594 and #32594 refers a variable introduced within.
Fixes #32898.
Fixes #32900.
Fixes #32895.
/cc @cockroachdb/release
Release note (bug fix): resolve a cluster degradation scenario that
could occur during IMPORT/RESTORE operations, manifested through a
high number of pending Raft snapshots.