Test transformer on Transformation service QA iModels in pipeline for regression testing

[MichaelBelousov]

create an independent pipeline that runs an identity transform (and perhaps also some physical consolidations or other common variants) on models in the https://qa-connect-imodelhubwebsite.bentley.com/Context/f8e2e8ab-971d-49c4-a976-d6c771396a7a#Thumbnails project that the Transformation service uses, in order to prevent regressions.

Then when the transformer is split out of the core packages in another major release, the pipeline can be ran before releases.

[MichaelBelousov]

@DanRod1999

Currently there is some work for this on the performance-scripts branch. It needs probably however to be separated from the performance tools that are also on that branch.