Start eslint 9 migration

For #230339

Starts migrating to eslint 9. Everything runs but it produces a number of errors

.eslint-plugin-local/vscode-dts-interface-naming.ts

@@ -0,0 +1,36 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as eslint from 'eslint';
+import { TSESTree } from '@typescript-eslint/utils';
+
+export = new class ApiInterfaceNaming implements eslint.Rule.RuleModule {
+
+	private static _nameRegExp = /^I[A-Z]/;
+
+	readonly meta: eslint.Rule.RuleMetaData = {
+		messages: {
+			naming: 'Interfaces must not be prefixed with uppercase `I`',
+		},
+		schema: false,
+	};
+
+	create(context: eslint.Rule.RuleContext): eslint.Rule.RuleListener {
+
+		return {
+			['TSInterfaceDeclaration Identifier']: (node: any) => {
+
+				const name = (<TSESTree.Identifier>node).name;
+				if (ApiInterfaceNaming._nameRegExp.test(name)) {
+					context.report({
+						node,
+						messageId: 'naming'
+					});
+				}
+			}
+		};
+	}
+};
+