Document that Copilot coding agent is available for Copilot trial users (#56544)

Co-authored-by: hubwriter <hubwriter@github.com>

Author: timrogers

data/reusables/gated-features/copilot-coding-agent.md

@@ -1 +1 @@
-{% data variables.copilot.copilot_coding_agent %} is available with the {% data variables.copilot.copilot_pro %}, {% data variables.copilot.copilot_pro_plus %}, {% data variables.copilot.copilot_for_business %} and {% data variables.copilot.copilot_enterprise %} plans. Access for {% data variables.product.prodname_copilot_short %} trials is coming soon. The agent is available in all repositories, except where it has been explicitly disabled and repositories owned by {% data variables.enterprise.prodname_managed_users %}.
+{% data variables.copilot.copilot_coding_agent %} is available with the {% data variables.copilot.copilot_pro %}, {% data variables.copilot.copilot_pro_plus %}, {% data variables.copilot.copilot_for_business %} and {% data variables.copilot.copilot_enterprise %} plans. The agent is available in all repositories, except where it has been explicitly disabled and repositories owned by {% data variables.enterprise.prodname_managed_users %}.