Fix possible exceptions due to addError's range/editColumn out of range, update test-extra to use test.serial() for better progress.

test/markdownlint-test-extra-type.js

@@ -18,7 +18,7 @@ for (const file of files) {
     strings[content.length.toString()] = content;
     content = content.slice(0, -1);
   }
-  test(`type ${file}`, (t) => {
+  test.serial(`type ${file}`, (t) => {
     t.plan(1);
     markdownlint.sync({
       // @ts-ignore

test/snapshots/markdownlint-test-scenarios.js.md

@@ -6521,7 +6521,7 @@ Generated by [AVA](https://avajs.dev).
           errorDetail: 'Expected: 0; Actual: 1',
           errorRange: [
             1,
-            3,
+            4,
           ],
           fixInfo: {
             deleteCount: 1,