Give the operator-extension Planner tests time to start the workflow backend

CI timed out the operator-extension test at Bun's 5 s default. Its first
workflow tool call starts Atomic's durable backend, and without Postgres
that falls back to the in-memory backend only after several seconds; with
no Postgres runtime and no Docker, the call alone took 4.7 s locally. The
test is split in two, and both tests that call the workflow tool get 30 s.

Assistant-model: Claude Opus 5.5
Assistant-workflow: inline
Assistant-verification: bun test failed before this change on CI: operator extension paths test timed out after 5000 ms
Assistant-verification: bun test passed: full.test.ts with PATH lacking docker and ATOMIC_POSTGRES_RUNTIME_DIR=/nonexistent (15 pass), and the whole suite (1908 pass, 2 skip, 0 fail)
Assistant-verification: bun run types and bun run ci passed: no new oxlint warnings, no new Impeccable findings
Co-authored-by: Alex Lavaee <lavaman131@github.com>