chore: enable runner to be rebuild with general watcher (#21664)

Co-authored-by: Matt Henkes <mjhenkes@gmail.com>

scripts/gulp/gulpfile.ts

@@ -17,7 +17,7 @@ import { makePathMap } from './utils/makePathMap'
 import { makePackage } from './tasks/gulpMakePackage'
 import { exitAfterAll } from './tasks/gulpRegistry'
 import { execSync } from 'child_process'
-import { webpackRunner } from './tasks/gulpWebpack'
+import { webpackRunner, webpackRunnerCT } from './tasks/gulpWebpack'
 import { e2eTestScaffold, e2eTestScaffoldWatch } from './tasks/gulpE2ETestScaffold'
 import dedent from 'dedent'
 
@@ -59,6 +59,7 @@ gulp.task(
   'dev:watch',
   gulp.parallel(
     webpackRunner,
+    webpackRunnerCT,
     gulp.series(
       makePathMap,
       // Before dev, fetch the latest "remote" schema from the Cypress dashboard

scripts/gulp/tasks/gulpWebpack.ts

@@ -7,9 +7,17 @@ import semver from 'semver'
 
 type Env = typeof process.env
 
-export function webpackRunner () {
+export function webpackRunnerCT () {
   return runWebpack({
     cwd: monorepoPaths.pkgRunnerCt,
+    prefix: 'webpack:runner:ct',
+    args: ['-w'],
+  })
+}
+
+export function webpackRunner () {
+  return runWebpack({
+    cwd: monorepoPaths.pkgRunner,
     prefix: 'webpack:runner',
     args: ['-w'],
   })