feat(challenge-redirect): Make '/challenge' and '/map' redirect to learn (#17144)

* feat(challenge-redirect): Make '/challenge' and '/map' redirect to learn

* fix(linting): Generate pathMigrationMap on 'prelint-js'

* fix(script): fix "only once" script

* fix(lock): Fix lock file

gulpfile.js

@@ -38,7 +38,9 @@ const Rx = require('rx'),
 
   // rev
   rev = require('gulp-rev'),
-  revDel = require('rev-del');
+  revDel = require('rev-del'),
+
+  { createPathMigrationMap } = require('./seed/createPathMigrationMap');
 
 Rx.config.longStackSupport = true;
 const sync = browserSync.create('fcc-sync-server');
@@ -395,6 +397,10 @@ gulp.task('build-manifest', buildDependents, function() {
     .pipe(gulp.dest('server/'));
 });
 
+gulp.task('generate-migration-map', done => {
+  createPathMigrationMap().then(done);
+});
+
 gulp.task('build', [
   'less',
   'js',
@@ -402,7 +408,8 @@ gulp.task('build', [
   'pack-frame-runner',
   'move-webpack-manifest',
   'clean-webpack-manifest',
-  'build-manifest'
+  'build-manifest',
+  'generate-migration-map'
 ]);
 
 const watchDependents = [
@@ -424,5 +431,6 @@ gulp.task('default', [
   'serve',
   'watch',
   'dev-server',
-  'pack-frame-runner'
+  'pack-frame-runner',
+  'generate-migration-map'
 ]);