chore(keyring-controller): remove QRKeyring-related code (MetaMask#6031)

## Explanation

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Dependent on:
  - ~~MetaMask/accounts#60

This PR removes all code related to the QRKeyring from KeystoneHQ, which
we intend to deprecate in favor of the new QRKeyring implementation in
the MetaMask accounts monorepo, that fully supports our Keyring type.

## References

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* Fixes MetaMask#4341 

## Changelog

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## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/contributing.md#updating-changelogs),
highlighting breaking changes as necessary
- [ ] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

Author: mikesposito

eslint-warning-thresholds.json

@@ -193,11 +193,11 @@
     "n/no-unsupported-features/node-builtins": 1
   },
   "packages/keyring-controller/src/KeyringController.test.ts": {
-    "import-x/namespace": 14,
-    "jest/no-conditional-in-test": 8
+    "import-x/namespace": 5,
+    "jest/no-conditional-in-test": 2
   },
   "packages/keyring-controller/src/KeyringController.ts": {
-    "@typescript-eslint/no-unsafe-enum-comparison": 4,
+    "@typescript-eslint/no-unsafe-enum-comparison": 2,
     "@typescript-eslint/no-unused-vars": 1
   },
   "packages/keyring-controller/tests/mocks/mockKeyring.ts": {

packages/keyring-controller/CHANGELOG.md

@@ -14,6 +14,26 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Bump `@metamask/keyring-api` from `^20.0.0` to `^20.1.0`
   - Bump `@metamask/keyring-internal-api` from `^8.0.0` to `^8.1.0`
 
+### Removed
+
+- **BREAKING:** Removed QR keyring methods ([#6031](https://github.com/MetaMask/core/pull/6031))
+  - The following methods have been removed:
+    - `cancelQRSignRequest`
+    - `cancelQRSynchronization`
+    - `connectQRHardware`
+    - `forgetQRDevice`
+    - `getOrAddQRKeyring`
+    - `getQRKeyring`
+    - `getQRKeyringState`
+    - `resetQRKeyringState`
+    - `restoreQRKeyring`
+    - `submitQRCryptoHDKey`
+    - `submitQRCryptoAccount`
+    - `submitQRSignature`
+    - `unlockQRHardwareWalletAccount`
+  - Consumers can use the `withKeyring` method to select a QR keyring and execute a callback with it as argument.
+- **BREAKING:** Removed `KeyringController:qrKeyringStateChange` event ([#6031](https://github.com/MetaMask/core/pull/6031))
+
 ## [22.1.1]
 
 ### Changed

packages/keyring-controller/jest.config.js

@@ -17,10 +17,10 @@ module.exports = merge(baseConfig, {
   // An object that configures minimum threshold enforcement for coverage results
   coverageThreshold: {
     global: {
-      branches: 94.31,
+      branches: 95.78,
       functions: 100,
-      lines: 98.79,
-      statements: 98.8,
+      lines: 98.68,
+      statements: 98.69,
     },
   },
 

packages/keyring-controller/package.json

@@ -48,7 +48,6 @@
   },
   "dependencies": {
     "@ethereumjs/util": "^9.1.0",
-    "@keystonehq/metamask-airgapped-keyring": "^0.14.1",
     "@metamask/base-controller": "^8.1.0",
     "@metamask/browser-passworder": "^4.3.0",
     "@metamask/eth-hd-keyring": "^12.0.0",
@@ -66,7 +65,6 @@
   "devDependencies": {
     "@ethereumjs/common": "^4.4.0",
     "@ethereumjs/tx": "^5.4.0",
-    "@keystonehq/bc-ur-registry-eth": "^0.19.0",
     "@lavamoat/allow-scripts": "^3.0.4",
     "@lavamoat/preinstall-always-fail": "^2.1.0",
     "@metamask/auto-changelog": "^3.4.4",