Remove Secure Backup, Cross-signing and Cryptography sections in Security & Privacy user settings (#29088)

* feat(security tab)!: remove secure backup panel

BREAKING CHANGE: the key storage user interaction are moved into the Encryption tab. The debugging information are moved into the devtools.

* feat(security tab)!: remove cross signing section

BREAKING CHANGE: the cryptographic identity can be reseted in the Encryption tab. The debugging information are moved into the devtools

* feat(security tab)!: remove cryptography section

BREAKING CHANGE: this section can be found in the Advanced section of the encryption tab.

* test(security tab): update snapshot

* chore(security tab): remove unused component and function

* chore(security tab): update i18n

* test(e2e): remove `backups.spec.ts`

src/utils/FormattingUtils.ts

@@ -56,17 +56,6 @@ export function formatBytes(bytes: number, decimals = 2): string {
     return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + " " + sizes[i];
 }
 
-/**
- * format a key into groups of 4 characters, for easier visual inspection
- *
- * @param {string} key key to format
- *
- * @return {string}
- */
-export function formatCryptoKey(key: string): string {
-    return key.match(/.{1,4}/g)!.join(" ");
-}
-
 export function getUserNameColorClass(userId: string): string {
     // eslint-disable-next-line react-hooks/rules-of-hooks
     const number = useIdColorHash(userId);