Parse perfConfigJson in L1 and auto gen L2.

[MattyWeee123]

All necessary data from perfConfigJson is extracted in L1 instead of L2 and propogated down in params. Each item in perfConfigJson corresponds to unique L2 job.

Changed BENCHMARKS to BENCHMARK, since current perfConfigJson format supplies only one benchmark per item.

Instead of deleting logs on demand in aggregateLogs, defer to a final cleanup step in L2.

Fixes: https://github.com/adoptium/aqa-tests/issues/6351

Signed-off-by: Matthew Wei [email protected]