Enable eslint rule to disallow awaiting a non-thenable type

extensions/ql-vscode/.eslintrc.js

@@ -29,6 +29,7 @@ const baseConfig = {
     "plugin:@typescript-eslint/recommended",
   ],
   rules: {
+    "@typescript-eslint/await-thenable": "error",
     "@typescript-eslint/no-use-before-define": 0,
     "@typescript-eslint/no-unused-vars": [
       "warn",

extensions/ql-vscode/src/extension.ts

@@ -462,7 +462,7 @@ export async function activate(
     ) {
       registerErrorStubs([checkForUpdatesCommand], (command) => async () => {
         const installActionName = "Install CodeQL CLI";
-        const chosenAction = await void showAndLogErrorMessage(
+        const chosenAction = await showAndLogErrorMessage(
           `Can't execute ${command}: missing CodeQL CLI.`,
           {
             items: [installActionName],