decrease runners after fixed performance degradation

[alexrashed]

Motivation

With #10742, moto-ext was upgraded to 5.0.6.post2.
Unfortunately, this release caused a performance degradation, which was addressed in getmoto/moto#7700.
This fix landed in localstack with #10843.
While this fix was in progress / not yet in affect, we updated our runner config to avoid any timeouts with #10833 and #10837.
This PR reverts this increased amount of runners now that the performance degradation has been fixed.

Changes

• Revert parallelism back to 4.
• Update the test durations once more.

TODO

• Collect test durations.
• Add new test durations and revert changes necessary to collect them.
• Compare the execution time with the execution time before the initial moto upgrade.
  • Community Integration Tests against Pro
    • Runners not decreased, only balancing
    • This PR
      • https://github.com/localstack/localstack/actions/runs/9175525983/attempts/3
        58m 4s
      • https://github.com/localstack/localstack/actions/runs/9175525983/attempts/4
        57m 53s
    • Before moto-ext bump (with same amount of runnners as this PR)
      • https://github.com/localstack/localstack/actions/runs/9074627800
        54m 30s
    • Current master (with more runners)
      • https://github.com/localstack/localstack/actions/runs/9161101758
        57m 56s
  • CircleCI
    • This PR
      • https://app.circleci.com/pipelines/github/localstack/localstack/25030/workflows/e49832c4-6e7c-43ac-806e-41c7633fd162
        47m 36s
      • https://app.circleci.com/pipelines/github/localstack/localstack/25030/workflows/28ef7ccc-fdf2-4c4e-bac8-2406d5419f62
        45m 58s
    • Before moto-ext bump (with same amount of runnners as this PR)
      • https://app.circleci.com/pipelines/github/localstack/localstack/24798/workflows/3f1bae4a-051e-4865-b28b-ef1be0c41654
        47m 22s
    • Current master (with more runners)
      • https://app.circleci.com/pipelines/github/localstack/localstack/25029/workflows/0e97bcbb-467b-4497-a6c4-034f40bde514
        39m 44s

[github-actions]

LocalStack Community integration with Pro

    2 files  ±0      2 suites  ±0   1h 41m 35s ⏱️ + 1m 5s
2 980 tests ±0  2 675 ✅ ±0  305 💤 ±0  0 ❌ ±0 
2 982 runs  ±0  2 675 ✅ ±0  307 💤 ±0  0 ❌ ±0 

Results for commit 7c94311. ± Comparison against base commit a462e47.

♻️ This comment has been updated with latest results.

[viren-nadkarni]

👍

[silv-io]

LGTM!