Mark ContributionReporting has obsolete

From Bug 61598, ContributionReporting extension is obsolete so we can
keep the jslint job non voting.

Change-Id: I4fe59f7724a7c62330b1b87b1fada74129c618b0
Trigger jobs for mw/ext/TextExtracts

With unit tests!

Bug: 63260
Change-Id: Ibb6d075ea2d06c1a10969bab9643469c216066a2