Rework more tests to minimise app reinitialisation

[knolleary]

Part of #2004

Some more test refactoring to minimise reinitialisation of the forge app.

When running these tests locally, it reduces the runtime from 60s to 12s.

[Steve-Mcl]

getting sooo much better. 6m for default test run.

Quick Question: Have you tried running the odd random, middle of the pack test on its own (using VSCode Mocha Test plugin or editing the file with .only)?

[knolleary]

Quick Question: Have you tried running the odd random, middle of the pack test on its own (using VSCode Mocha Test plugin or editing the file with .only)?

I haven't done that for every single test, but it is certainly one of the things I do when I need to isolate a test to figure out what its requirements are on the forge app to ensure it gets a clear start.

[knolleary]

Odd that postgres is still getting a genuine test failure. I thought I had squashed that.

[knolleary]

@Steve-Mcl tests now passing - ready for review/merge