fix(server): Sequence destroy() callback after native teardown

[RandomByte]

Fixes a unit test failing flakily in CI, most often on Node 22/24 on Windows, with test/lib/server/reinitialize.js exited with a non-zero exit code: 3221225477. That code is 0xC0000005, a native access violation on process teardown, not a test-assertion failure. The defect is in production teardown code, so the fix lands in Supervisor.js; the flaky reinitialize test is what surfaced it.

Root cause

Supervisor.destroy() passed the caller's callback to http.Server.close(), firing it on socket close. The BuildServer's teardown (the @parcel/watcher unsubscribe and the node:sqlite handle, which maps a 256 MB region of the database into memory) runs after that call and was not sequenced ahead of the callback, so server.close(resolve) resolved with SQLite still mid-close. The next test.serial opening a fresh DatabaseSync, or the worker exiting, then races the finalizing handle and raises an access violation on Windows (0xC0000005), surfacing as exited with a non-zero exit code: 3221225477 in the reinitialize suite.

Fix

Start the socket close, then await the definition watcher and BuildServer teardown, and await the socket last. The callback fires only once every native handle is closed.