Convert pure tests to Jest

This converts all pure tests to Jest. This was done by first running
`npx jest-codemods` with the Mocha transformation, then manually fixing
any places where it hadn't automatically converted the correct thing
or had missed things (mostly Sinon).

This also sets up VSCode correctly for running Jest.

.vscode/extensions.json

@@ -5,7 +5,8 @@
   "recommendations": [
     "amodio.tsl-problem-matcher",
     "dbaeumer.vscode-eslint",
-    "esbenp.prettier-vscode"
+    "esbenp.prettier-vscode",
+    "Orta.vscode-jest",
   ],
   // List of extensions recommended by VS Code that should not be recommended for users of this workspace.
   "unwantedRecommendations": []

.vscode/launch.json

@@ -29,24 +29,16 @@
       "name": "Launch Unit Tests (vscode-codeql)",
       "type": "node",
       "request": "launch",
-      "program": "${workspaceFolder}/extensions/ql-vscode/node_modules/mocha/bin/_mocha",
+      "program": "${workspaceFolder}/extensions/ql-vscode/node_modules/jest/bin/jest.js",
       "showAsyncStacks": true,
       "cwd": "${workspaceFolder}/extensions/ql-vscode",
-      "runtimeArgs": [
-        "--inspect=9229"
-      ],
       "env": {
-        "LANG": "en-US"
+        "LANG": "en-US",
+        "TZ": "UTC"
       },
       "args": [
-        "--exit",
-        "-u",
-        "bdd",
-        "--colors",
-        "--diff",
-        "--config",
-        ".mocharc.json",
-        "test/pure-tests/**/*.ts"
+        "--projects",
+        "test"
       ],
       "stopOnEntry": false,
       "sourceMaps": true,
@@ -60,6 +52,10 @@
       "program": "${workspaceFolder}/extensions/ql-vscode/node_modules/jest/bin/jest.js",
       "showAsyncStacks": true,
       "cwd": "${workspaceFolder}/extensions/ql-vscode",
+      "args": [
+        "--projects",
+        "src/view"
+      ],
       "stopOnEntry": false,
       "sourceMaps": true,
       "console": "integratedTerminal",
@@ -117,7 +113,7 @@
         "--disable-extension",
         "github.copilot",
         "${workspaceRoot}/extensions/ql-vscode/src/vscode-tests/cli-integration/data",
-        // Uncomment the last line and modify the path to a checked out 
+        // Uncomment the last line and modify the path to a checked out
         // instance of the codeql repository so the libraries are
         // available in the workspace for the tests.
         // "${workspaceRoot}/../codeql"

.vscode/settings.json

@@ -37,6 +37,11 @@
   "javascript.preferences.quoteStyle": "single",
   "editor.wordWrapColumn": 100,
   "jest.rootPath": "./extensions/ql-vscode",
+  "jest.autoRun": "watch",
+  "jest.nodeEnv": {
+    "LANG": "en-US",
+    "TZ": "UTC"
+  },
   "[typescript]": {
     "editor.defaultFormatter": "esbenp.prettier-vscode",
     "editor.formatOnSave": true,