Refactor report generation logic into a separate repository

The following file contains report generation logic that could potentially be utilised by multiple testing and benchmarking efforts

https://github.com/dask/distributed/blob/main/continuous_integration/scripts/test_report.py

It may be beneficial to split report generation logic into a separate repository:

/cc @fjetter @jrbourbeau @ncclementi @crusaderky @jcrist @bryanwweber @ian-r-rose @phobson