CA v legacy grid test

Add a new test test_trigP1_v1Dev_newJO_grid.py comparing CA to legacy over a larger set of events than the build test - ATR-27049

Test runs first the legacy to create the reference, rather than needing to compare to other tests or having a reference stored in the release.

Several points to discus before merging:

• The count comparison is set as required but from testing it will be blocked by ATR-28477 so will currently fail. We want the result checked though, so believe this is the easiest way for shifters to notice/report the difference.
• The legacy part of the test duplicates test_trigP1_v1Dev_grid.py so this test could be removed either now or in the near future.
• The test is new so will need references generating for rootcomp.
• This test runs athenaHLT on data, do we want to do similar for MC?

cc @fwinkl @fpastore @martindl @cpollard @wiedenma @okuprash @sshaw @khoo