The spec/features/merge_request/user_interacts_with_batched_mr_diffs_spec.rb failing intermittently

As mentioned in !49118 (comment 461346855), the scenario "Batch diffs when user visits a URL with a link directly to to a discussion which is in at least page 2 of the batched pages of diffs scrolls to the correct discussion" is failing intermittently.

Initial investigation shows that the page isn't scrolling to the actual discussion being expected after the page has loaded. It doesn't happen all the time and can be replicated manually on development by refreshing the page lots of times.