chore: Add copy code owner for agent-facing text [internal]

- Route server instructions, pricing text, and error messages to copy review

- Matches the copy ownership already in apify-core

Author: jgagne

.github/CODEOWNERS

@@ -1 +1,6 @@
 /.github/workflows/factory_review.yaml @mtrunkat
+
+# Copy review for text that agents read
+/src/utils/server-instructions/ @jgagne
+/src/utils/pricing_info.ts @jgagne
+/src/utils/apify_errors.ts @jgagne