Merge branch '48072-bs4-labels-in-issues-system-notes-are-misaligned-again' into 'master'

Resolve "BS4: Labels in issues system notes are misaligned again"

Closes #48072

See merge request gitlab-org/gitlab-ce!19972

app/assets/stylesheets/bootstrap_migration.scss

@@ -173,7 +173,10 @@ table {
   display: none;
 }
 
-.badge {
+// Add to .label so that old system notes that are saved to the db
+// will still receive the correct styling
+.badge,
+.label {
   padding: 4px 5px;
   font-size: 12px;
   font-style: normal;