Datasource: fix a bug where deleting data source will trigger save and test events (#21300)

public/app/features/datasources/settings/ButtonRow.tsx

@@ -30,7 +30,7 @@ const ButtonRow: FC<Props> = ({ isReadOnly, onDelete, onSubmit, onTest }) => {
         </button>
       )}
       <button
-        type="submit"
+        type="button"
         className="btn btn-danger"
         disabled={isReadOnly}
         onClick={onDelete}

public/app/features/datasources/settings/__snapshots__/ButtonRow.test.tsx.snap

@@ -16,7 +16,7 @@ exports[`Render should render component 1`] = `
     className="btn btn-danger"
     disabled={true}
     onClick={[MockFunction]}
-    type="submit"
+    type="button"
   >
     Delete
   </button>
@@ -47,7 +47,7 @@ exports[`Render should render with buttons enabled 1`] = `
     className="btn btn-danger"
     disabled={false}
     onClick={[MockFunction]}
-    type="submit"
+    type="button"
   >
     Delete
   </button>