Remove test for internal diff engine acceptance
Remove test for internal diff engine acceptance

Since the internal diff engine is now always used this test
seems to be unnecessary.

Bug: T93625
Change-Id: I536474dc6231138293c9efc813a1bc2cc1e6f3b0

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo