chore: Ignore generated and vendored files in Biome formatter (#32346)

Co-authored-by: n8n-cat-bot[bot] <n8n-cat-bot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

biome.jsonc

@@ -31,7 +31,13 @@
 		"attributePosition": "auto",
 		"ignore": [
 			// Handled by prettier
-			"**/*.vue"
+			"**/*.vue",
+			// Generated DB schema docs
+			"docs/generated/**",
+			// Generated / vendored test-impact data
+			".github/test-metrics/**",
+			// Vendored SPDX license data and overrides
+			"scripts/licenses/**"
 		]
 	},
 	"organizeImports": { "enabled": false },