[DRAFT] Improve the host test performance

[IanCal]

Several things seem to be really hitting the host test performance locally:

1. Loading modules (particularly card-api which can cost ~500ms per simple test)
2. Creating test realms
3. Creating matrix things

Here I've added two major things:

1. Snapshotting state (database, matrix, loader) after creating realms
2. Not reloading the base realm items again and again

The snapshots are purely in memory, so there is no caching to manage between test runs. The concept is that the first test run creates the realm/etc in the beforeeach, and this is then snapshotted and restored for all following tests that use the same beforeeach.

[github-actions]

Preview deployments

• Host staging preview
• Host production preview

[github-actions]

Host Test Results

    1 files      1 suites   44m 8s ⏱️
1 749 tests 1 657 ✅ 13 💤  0 ❌ 79 🔥
1 756 runs  1 585 ✅ 13 💤 79 ❌ 79 🔥

For more details on these errors, see this check.

Results for commit c9707bf.

♻️ This comment has been updated with latest results.