Fix apply suggestion transient test

Prior to this change, the selector was not
moved to another vue file when considering
functionality

This change applies the qa selector
on the correct vue file and unblocks the
failing test

app/assets/javascripts/diffs/components/diff_row.vue

@@ -203,6 +203,7 @@ export default {
                 :draggable="glFeatures.dragCommentSelection"
                 type="button"
                 class="add-diff-note unified-diff-components-diff-note-button note-button js-add-diff-note-button qa-diff-comment"
+                data-qa-selector="diff_comment_button"
                 :class="{ 'gl-cursor-grab': dragging }"
                 :disabled="line.left.commentsDisabled"
                 @click="handleCommentButton(line.left)"

app/assets/javascripts/diffs/components/inline_diff_table_row.vue

@@ -140,7 +140,6 @@ export default {
           ref="addDiffNoteButton"
           type="button"
           class="add-diff-note note-button js-add-diff-note-button"
-          data-qa-selector="diff_comment_button"
           :disabled="line.commentsDisabled"
           @click="handleCommentButton"
         >

qa/qa/page/merge_request/show.rb

@@ -67,8 +67,11 @@ module QA
           element :edit_in_ide_button
         end
 
-        view 'app/assets/javascripts/diffs/components/inline_diff_table_row.vue' do
+        view 'app/assets/javascripts/diffs/components/diff_row.vue' do
           element :diff_comment_button
+        end
+
+        view 'app/assets/javascripts/diffs/components/inline_diff_table_row.vue' do
           element :new_diff_line_link
         end