Remove common test utils from release build

[Alenar]

This will prevent us from using common test utilities in production code (since now we don't have to use the fake data anymore). Hopefully this should also reduce the aggregator compilation time.

[github-actions[bot]]

Unit Test Results

    7 files  ±0    22 suites  ±0   1m 30s :stopwatch: -41s 293 tests ±0  293 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  294 runs  ±0  294 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit c18fd728. ± Comparison against base commit e0916d3d.

:recycle: This comment has been updated with latest results.

[Alenar]

This doesn't work as expected: cargo will always include the test-util features. The only way to do that correctly would be extracting test-only code in a dedicated crate but ... some of it in common is used by common itself, avoiding circular dependency will be difficult.

Closing :(