Support generation of jUnit/xUnit test results from perf test run

Currently, we only generate a TAP file for perf test runs which isn't very flexible for CI systems that don't support TAP.

From talking with @smlambert it seems we could likely generate an xUnit report (in the same way as we do for JCK tests) using a template file similar to https://github.com/adoptium/aqa-tests/blob/master/jck/xUnit.xsl

Start by comparing the existing TAP output for perf test runs with the JCK test xUnit generation and the referenced jck/xUnit.xsl template. Trace the perf test run entry point and determine where a JUnit/xUnit report can be emitted. Done means CI systems without TAP support can consume the generated report.

Written by the indexing model from the issue text.