extension/package.json: bump gts to 7.0.0

Upgrade gts to 7.0.0, migrate to ESLint v9 flat config
(eslint.config.js), and update lint directives.

Before: 3 low, 18 high
After:  3 low, 10 high

Change-Id: I33b4a090fabfdc53a6c3bbc6bc1cfb3dce963ae5
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/807480
Auto-Submit: Hongxiang Jiang <hxjiang@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Peter Weinberger <pjw@google.com>

Author: h9jiang

extension/.eslintignore

@@ -0,0 +1,24 @@
+const gts = require('gts');
+
+module.exports = [
+	...gts,
+	{
+		ignores: ['out/**', 'dist/**', 'build/**', 'node_modules/**', '.vscode-test/**']
+	},
+	{
+		linterOptions: {
+			reportUnusedDisableDirectives: 'warn'
+		},
+		rules: {
+			// TODO(hxjiang): fix problem reported and enable all the rules below.
+			'@typescript-eslint/no-floating-promises': 'off',
+			'@typescript-eslint/no-explicit-any': 'off',
+			'@typescript-eslint/no-unused-vars': 'off',
+			'n/no-missing-import': 'off',
+			'n/no-unpublished-import': 'off',
+			'n/no-extraneous-import': 'off',
+			'n/no-deprecated-api': 'off',
+			'n/no-unsupported-features/node-builtins': 'off'
+		}
+	}
+];