Resolves #45220 (one of several PRs to achieve removing "testing" package as dependency in production binary) ## Testing - [x] QA'd all new/changed functionality manually. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Tests** * Switched many tests to use a dedicated MySQL test helper package and consolidated test-only utilities for datastore setup, cleanup, ad‑hoc SQL, certificate generation, and activity/aggregation helpers. * Added expanded test utilities for replication, DB connections and test data seeding to improve integration-test reliability. * **Chores** * No production behavior or user-facing APIs were changed. <!-- review_stack_entry_start --> [](https://app.coderabbit.ai/change-stack/fleetdm/fleet/pull/45406) <!-- review_stack_entry_end --> <!-- end of auto-generated comment: release notes by coderabbit.ai -->
pkg directory
This top-level pkg directory contains packages that may be shared between all fleet backend components.