fix(lint): Deno.lint.runPlugin throws in deno run (#28063)

This commit changes `Deno.lint.runPlugin` to throw
in non-`deno test` subcommand, instead of returning
`undefined`.

runtime/js/99_main.js

@@ -585,7 +585,11 @@ const finalDenoNs = {
   test: () => {},
   bench: () => {},
   lint: {
-    runPlugin: () => {},
+    runPlugin: () => {
+      throw new Error(
+        "`Deno.lint.runPlugin` is only available in `deno test` subcommand.",
+      );
+    },
   },
 };