[test] refactor and fixes for blobs vs legacy test

- create payloads before running tests
- use different group names for different amount/sizes
- move legacy index creation to setup function
- limit concurrency on blobmanager to 2 (same as thread pool size)
- add a VACUUM call to observe blobs db size decreasing between tests
- properly cleanup server between blobs test runs
- refactor blobs pipeline so it makes more sense and is easier to read

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