howto jenkins job doc

[andrlos]

https://github.com/adoptium/aqa-tests/issues/1558

copying the Jenkins features reference from wiki https://github.com/adoptium/aqa-tests/wiki/How-to-Run-a-Grinder-Build-on-Jenkins#reference to the docs.. splitting into jenkins howto quickguide and a wiki-like exhaustive reference with all the jenkins parameters

before reviewing, please decide, if we want to add the table of contents similar to the source documentation on wiki https://github.com/adoptium/aqa-tests/wiki/How-to-Run-a-Grinder-Build-on-Jenkins#rerun-a-failing-openjdk-regression-test, which can be done easily

Cheers!