Add web_search to expected Config defaults in workers-utils tests

The normalize-and-validate-config test asserts the default Config
object satisfies the Config type. Adding web_search as a required
Environment field (alongside ai/browser) means the expected defaults
literal must include 'web_search: undefined' as well.

Author: G4brym

packages/workers-utils/tests/config/validation/normalize-and-validate-config.test.ts

@@ -89,6 +89,7 @@ describe("normalizeAndValidateConfig()", () => {
 			text_blobs: undefined,
 			browser: undefined,
 			ai: undefined,
+			web_search: undefined,
 			version_metadata: undefined,
 			triggers: {
 				crons: undefined,