test failed in CI: db-dev::test-db-dev test_db_run

[jgallagher]

This test failed on a CI run on PR #7428:

https://github.com/oxidecomputer/omicron/pull/7428/checks?check_run_id=36364357016

Log showing the specific test failure:

https://buildomat.eng.oxide.computer/wg/0/details/01JJSCVHZC6J3VQW664BHDCJMJ/3H7s0iynm0IsLFeoEjnGZrLNLUsKIxrfw6DW1eaibQg4GbKo/01JJSCVWF6SBW3EVQ27VPWN5SK

Excerpt from the log showing the failure:

5438	2025-01-29T17:26:22.799Z	subproc stdout: WARN: dropped CockroachInstance without cleaning it up first (there may still be a child process running and a temporary directory leaked)
5439	2025-01-29T17:26:22.807Z	subproc stdout: WARN: temporary directory leaked: "/var/tmp/omicron_tmp/.tmpQowpZL"
5440	2025-01-29T17:26:22.807Z	subproc stdout: 	If you would like to access the database for debugging, run the following:
5441	2025-01-29T17:26:22.807Z	subproc stdout:
5442	2025-01-29T17:26:22.807Z	subproc stdout: 	# Run the database
5443	2025-01-29T17:26:22.807Z	subproc stdout: 	cargo xtask db-dev run --no-populate --store-dir "/var/tmp/omicron_tmp/.tmpQowpZL/data"
5444	2025-01-29T17:26:22.807Z	subproc stdout: 	# Access the database. Note the port may change if you run multiple databases.
5445	2025-01-29T17:26:22.807Z	subproc stdout: 	cockroach sql --host=localhost:32221 --insecure
5446	2025-01-29T17:26:22.807Z	subproc stdout: Error: populating database
5447	2025-01-29T17:26:22.807Z	subproc stdout:
5448	2025-01-29T17:26:22.808Z	subproc stdout: Caused by:
5449	2025-01-29T17:26:22.808Z	subproc stdout:     0: populate
5450	2025-01-29T17:26:22.808Z	subproc stdout:     1: populating Omicron database
5451	2025-01-29T17:26:22.808Z	subproc stdout:     2: db error: ERROR: transaction committed but schema change aborted with error: (53200): failed to ingest index entries during backfill: not enough memory available to create a BulkAdder: root: memory budget exceeded: 33554432 bytes requested, 102014976 currently allocated, 134217728 bytes in budget
5452	2025-01-29T17:26:22.808Z	subproc stdout:        HINT: Consider increasing --max-sql-memory startup parameter.
5453	2025-01-29T17:26:22.808Z	subproc stdout:        --
5454	2025-01-29T17:26:22.808Z	subproc stdout:        Try setting a higher --max-sql-memory.
5455	2025-01-29T17:26:22.808Z	subproc stdout:        --
5456	2025-01-29T17:26:22.808Z	subproc stdout:        Some of the non-DDL statements may have committed successfully, but some of the DDL statement(s) failed.
5457	2025-01-29T17:26:22.808Z	subproc stdout:        Manual inspection may be required to determine the actual state of the database.
5458	2025-01-29T17:26:22.808Z	subproc stdout:        --
5459	2025-01-29T17:26:22.808Z	subproc stdout:        See: https://github.com/cockroachdb/cockroach/issues/42061
5460	2025-01-29T17:26:22.808Z	subproc stdout:     3: ERROR: transaction committed but schema change aborted with error: (53200): failed to ingest index entries during backfill: not enough memory available to create a BulkAdder: root: memory budget exceeded: 33554432 bytes requested, 102014976 currently allocated, 134217728 bytes in budget
5461	2025-01-29T17:26:22.808Z	subproc stdout:        HINT: Consider increasing --max-sql-memory startup parameter.
5462	2025-01-29T17:26:22.808Z	subproc stdout:        --
5463	2025-01-29T17:26:22.808Z	subproc stdout:        Try setting a higher --max-sql-memory.
5464	2025-01-29T17:26:22.808Z	subproc stdout:        --
5465	2025-01-29T17:26:22.808Z	subproc stdout:        Some of the non-DDL statements may have committed successfully, but some of the DDL statement(s) failed.
5466	2025-01-29T17:26:22.808Z	subproc stdout:        Manual inspection may be required to determine the actual state of the database.
5467	2025-01-29T17:26:22.808Z	subproc stdout:        --
5468	2025-01-29T17:26:22.808Z	subproc stdout:        See: https://github.com/cockroachdb/cockroach/issues/42061

The failure mode here looks like #7141 (but that's a different DB test so figured I'd open this for ease of searching if this recurs).