refactoring the sanity tests with three goals:
1. move from env vars to cli commands so that unsupported commands fail loudly.
2. set up support for groups restore and export testing.
3. introduce some code re-use throughout.
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#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🤖 Supportability/Tests
#### Issue(s)
* #3988
#### Test Plan
- [x] 💚 E2E
centralizes the ci action for slack messages, and adds slack messages for per-resource cleanup failures.
---
#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🤖 Supportability/Tests
#### Issues
- #3503
