SPIKE: CFn: minor cleanups

[simonrw]

Motivation

Yes this is a grab bag of lots of changes, which is very bad PR etiquette...

This is mostly a way to run the CI on these changes. I may split the changes up in the future.

Changes

• Remove unused code
• Resolve FIXME
• Add get_instance method to stackset
• Fix metadata and typing
• Create initial v2 engine
• Fetch deployable resource ids
• Validate test_update_stack_actual_update
• Force resource fetching

[github-actions]

LocalStack Community integration with Pro

    2 files  ±0      2 suites  ±0   1h 38m 43s ⏱️ +39s
2 926 tests ±0  2 627 ✅  - 7  292 💤 ±0  7 ❌ +7 
2 928 runs  ±0  2 627 ✅  - 7  294 💤 ±0  7 ❌ +7 

For more details on these failures, see this check.

Results for commit 323e4ea. ± Comparison against base commit 3c06fd4b.