fix(tests): clean up writer to prevent windows test failure

[gagik]

We're applying a writer.end() to be consistent with other places of properly cleaning the writer after creation as it messes with Windows CI tests.

devtools-shared/packages/mongodb-log-writer/src/mongo-log-manager.spec.ts

Lines 571 to 573 in e3b8add

	// Still clean up here because Windows doesn’t like open files:
	writer.end();
	await once(writer, 'finish');