feat(client): shortcuts legend modal available on pressing the ? key (#45530)

* Add modal texts in translations.json file

* Add shortcuts modal state in redux

* Create shortcuts modal

* Integrate shortcuts modal

* Resolve codefactor.io issues

* Extend list of shortcuts

Based on this comment:
https://github.com/freeCodeCamp/freeCodeCamp/issues/36841#issuecomment-933310078

* Remove temporary placeholder for modal title

* Open modal fom Hotkeys instead of learn.tsx

As suggested in this comment:
https://github.com/freeCodeCamp/freeCodeCamp/pull/45530#issuecomment-1101224993

* Complete list in transaltions

* Change shortcut presentation fo better a11y

Use table instead of list items as suggestedin this comment:
https://github.com/freeCodeCamp/freeCodeCamp/pull/45530#issuecomment-1101796368

* Add aria-labelledby

* Remove GAnalytics

* Remove leftover style

* Remove table caption

* autofocus on modal close button

* Improve modal a11y

- Add requested changes from https://github.com/freeCodeCamp/freeCodeCamp/pull/45530#issuecomment-1104764766
- Leave autofocus and parent div role=dialog changes for later. (https://github.com/freeCodeCamp/freeCodeCamp/pull/45530#issuecomment-1107754148)

* [WIP] Alllow users to turn off keyboard shortcuts

* Add keyboard shortcuts switch in settings

* Disable shortcuts

* Remove toggle switch description

* Refactor and cleanup

* Remove close button from modal header

Suggested by bbsmooth:
https://github.com/freeCodeCamp/freeCodeCamp/pull/45530#issuecomment-1107861091

* Fix lint issues

* Disable shortcuts

* Disable shortcuts by default

* Update challenge output test

* Update challenge-hot-keys test

* Disable shortcuts from inside handlers

Co-authored-by: Mrugesh Mohapatra <1884376+raisedadead@users.noreply.github.com>

tools/scripts/seed/certifiedUserData.js

@@ -4711,6 +4711,7 @@ module.exports = {
   yearsTopContributor: ['2019'],
   rand: 0.6126749173148205,
   theme: 'default',
+  keyboardShortcuts: false,
   profileUI: {
     isLocked: false,
     showAbout: true,

tools/scripts/seed/seedAuthUser.js

@@ -84,7 +84,8 @@ const authUser = {
   },
   isDonating: envVariables.includes('--donor'),
   emailAuthLinkTTL: null,
-  emailVerifyTTL: null
+  emailVerifyTTL: null,
+  keyboardShortcuts: false
 };
 
 const blankUser = {