Created one Jenkins job template to rule them all

Bug: 53406
Change-Id: Ib84c895b1b0ba7441460b5178c8ab629828b88d1
Added support for running VisualEditor tests to Jenkins job template

See also https://gerrit.wikimedia.org/r/#/c/81486/

Bug: 53467
Change-Id: Idb76a104323e3c358478e553d6be4cff13c18cf5