Improve text for codeclimate report

Improves code coverage text to sound less condescending.

Does this MR meet the acceptance criteria?

• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #2951 (closed)

app/assets/javascripts/vue_merge_request_widget/ee/components/mr_widget_code_quality.vue

@@ -55,7 +55,7 @@ export default {
       let text = [];
       if (this.hasNoneIssues) {
-        text.push('No changes to code quality so far.');
+        text.push('No changes to code quality.');
       } else if (this.hasIssues) {
         if (newIssues.length) {
           newIssuesText = ` degraded on ${newIssues.length} ${this.pointsText(newIssues)}`;