[master] fix: replace rootPath in testJobDefinitions

Alexandre Franck Boyerrequested to merge
alboyer/LHCbDIRAC:master_fix_testUserJobsWithDifferentUsers into master

The rootPath parameter is not relevant anymore since tests and src can be located in different directories. The MR replaces rootPath by a parameter that we need to pass to the functions present in testJobDefinitions leading to the directory containing the tests.

BEGINRELEASENOTES *tests FIX: replace rootPath in testJobDefinitions ENDRELEASENOTES

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