add test for SQS FIFO dedup behaviour in high throughput mode

[baermat]

Motivation

While investigating a support case, I stumbled upon this behaviour which is not yet implemented. If a message uses the same message deduplication ID while the fifo queue is set to "high throughput mode", the deduplication id seems to be evaluated at a group level and not at the queue level. The effects on ordering still need to be investigated once we implement this feature (it is unclear to me why I would use this high throughput fifo queue over a regular queue).

Changes

• adds 1 test each for:
  • Same deduplication id with different message groups, normal mode
  • Same deduplication id with different message groups, high throughput mode

[coveralls]

coverage: 83.872% (+0.007%) from 83.865%
when pulling 50241ee on sqs-fifo-same-dedup-different-grps
into b558f3a on master.

[github-actions]

LocalStack Community integration with Pro

    2 files  ±0      2 suites  ±0   1h 20m 57s ⏱️ -37s
2 646 tests +4  2 397 ✅ +2  249 💤 +2  0 ❌ ±0 
2 648 runs  +4  2 397 ✅ +2  251 💤 +2  0 ❌ ±0 

Results for commit 50241ee. ± Comparison against base commit b558f3a.

[thrau]

that is excellent, really nice find @baermat! thanks for adding the test, always great to have keep an xfailed test around for a TODO 💯