Tomás Agustín González Orlando authored Oct 03, 2022 and Peter Hoyes committed Oct 13, 2022

In a previous commit, a summary of the ACS test suite results was
generated.

 * Use Python's difflib and filecmp to compare this file against a
   baseline file and detect any regressions or changes in regards to
   the previous state.

This simplifies the logic implemented by the project's recipes and
avoids the frequent use of regular expressions.

 * Generate an html diff report file for each one of the three major
   ACS test types (SCT, BSA and FWTS) and for the summary with the
   diff between the new results and the baseline. Only generate these
   files when differences with the baseline have been found.

NOTE: As some report files have time stamps for their tests, the
generated diff html report files will contain these marked as
differences. However, because of the way the diff files are displayed,
they are still easily readable to detect changes in test results and
so no further cleaning/pruning is now considered.

Issue-Id: SCM-5205
Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>
Change-Id: I1e6a00ab9bf8280f27f555f01ffb59214e15ebf8