Add timestamps at AQA_Test_Pipeline

[llxia]

To help debugging, we should add the timestamps in AQA_Test_Pipeline.

Add the following

timestamps {
...
}

around https://github.com/adoptium/aqa-tests/blob/bf67eefb47683a376fb21e69d8b669f203f4fdae/buildenv/jenkins/aqaTestPipeline.groovy#L41-L87