Deprecate/remove FF experimental local-specific IndexDB sorting

[hamishwillee]

FF intends to remove its experimental support for IndexDB and has started the process.

FF123 removed IDBLocaleAwareKeyRange in https://bugzilla.mozilla.org/show_bug.cgi?id=1730706 (more specifically, in https://phabricator.services.mozilla.com/D192064). This is behind a pref, and with this change the API is no longer usable - you can create locale indexes etc but they aren't sortable. The rest of the API is planned for removal in the same bug (but different phabricator revision) but is waiting on user count testing.

What I have done here is:

• Removed IDBLocaleAwareKeyRange as it is no longer present and was behind pref.
  • This is in line with removal policy.
  • Forwarded to the standard API.
• Deprecated the associated IDBIndex properties locale and isAutoLocale that are planned for removal.
• Deleted the section on local-sorting - we don't want people to start using this now.

Related docs work can be tracked in #31912

[github-actions]

Preview URLs

• /en-US/docs/Web/API/IDBIndex/isAutoLocale
• /en-US/docs/Web/API/IDBIndex/locale
• /en-US/docs/Web/API/IDBIndex
• /en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB
• /en-US/docs/Web/API/IndexedDB_API

External URLs (20)

URL: /en-US/docs/Web/API/IndexedDB_API
Title: IndexedDB API

• https://mdn.github.io/dom-examples/to-do-notifications/ (1 time)
• https://www.w3.org/Security/wiki/Same_Origin_Policy (1 time)

---

URL: /en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB
Title: Using IndexedDB

• https://bugzil.la/1112702 (1 time)
• https://bugzil.la/1147821 (1 time)
• https://bugzil.la/870645 (1 time)
• https://dexie.org/ (1 time)
• https://docs.microsoft.com/previous-versions/msdn10/gg679063(v=msdn.10) (1 time)
• https://github.com/hyoo-ru/mam_mol/tree/master/db (1 time)
• https://github.com/jakearchibald/idb (1 time)
• https://github.com/mWater/minimongo (1 time)
• https://jsstore.net/ (1 time)
• https://localforage.github.io/localForage/ (1 time)
• https://mdn.github.io/dom-examples/indexeddb-api/index.html (1 time)
• https://pouchdb.com (1 time)
• https://rxdb.info/ (1 time)
• https://searchfox.org/mozilla-central/search?q=dom%2FindexedDB%2F.*%5C.idl&path=&case=false&regexp=true (1 time)
• https://support.mozilla.org/en-US/kb/third-party-cookies-firefox-tracking-protection (1 time)
• https://web.dev/articles/indexeddb-uidatabinding (1 time)
• https://www.npmjs.com/package/idb-keyval (1 time)
• https://www.w3.org/TR/IndexedDB/ (2 times)