26143: opt: Enable additional logic tests for opt configs r=andy-kimball a=andy-kimball

Enable more logic tests (orms -> snapshot_unrelated_update).
Fix various bugs and issues that were failing tests.


26158: cli: fix `cockroach quit` r=knz a=knz

Informs/fixes #25870.
Fixes  #26144.

This patch fixes the following:

- the logic in `doShutdown()` aims to ignore errors caused by attempts
  connect to a server which is closing its gRPC channels, but was
  missing one case of such errors: during the initial check whether
  the node was running. This patch causes gRPC "closed connection"
  errors to become also ignored in that case.

- previously if there was a transient gRPC error during a hard
  shutdown whereby the shutdown could still succeed, then `cockroach
  quit` would fail no matter what. This patch makes `cockroach quit`
  retry a hard shutdown.

- the warning messages are now emitted on stderr (via `log.Warningf`)
  instead of stdout.

Release note (bug fix): fix a bug where `cockroach quit` would
erroneously fail even though the node already successfully shut down.

Release note (cli change): `cockroach quit` now emits warning message
on its standard error stream, not standard output.

26165: roachtest: enable periodic heap prof output for kv/splits/nodes=3 r=tschottdorf a=petermattis

See #26081

Release note: None

26167: encryption: add cli command `cockroach gen encryption-key` r=windchan7 a=windchan7

Added cli command `cockroach gen encryption-key` to generate store keys for
encryption at rest.

Encryption CLI: #19783.
Release note: None

Co-authored-by: Andrew Kimball <andyk@cockroachlabs.com>
Co-authored-by: Raphael 'kena' Poss <knz@cockroachlabs.com>
Co-authored-by: Peter Mattis <petermattis@gmail.com>
Co-authored-by: Victor Chen <victor@cockroachlabs.com>