Fixing Batch Suggestions test

What does this MR do?

After some changes to the suggestion elements of the merge request page, our tests were not working as they should. The normal button that gives the option to apply the changes added to the bulk change is now available on every suggestion. Because of this, I changed the page object to actually choose the first out of one or more and click it, since there is no difference in which one you click.

E2E Test Failure issue(s)

#342131 (closed)

Check-list

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