Add note to docs about billing for premium requests availability for data residency (#56255)

Co-authored-by: mc <42146119+mchammer01@users.noreply.github.com>

Author: sophietheking

content/admin/data-residency/feature-overview-for-github-enterprise-cloud-with-data-residency.md

@@ -30,6 +30,7 @@ The following features are currently unavailable on {% data variables.enterprise
 | {% data variables.product.prodname_copilot_short %} Metrics API | Currently unavailable | [AUTOTITLE](/rest/copilot/copilot-metrics) |
 | {% data variables.copilot.copilot_coding_agent %} | Currently unavailable | [AUTOTITLE](/copilot/using-github-copilot/coding-agent/about-assigning-tasks-to-copilot) |
 | Restricting {% data variables.product.prodname_actions %} policies to verified creators | Currently unavailable | [AUTOTITLE](/admin/enforcing-policies/enforcing-policies-for-your-enterprise/enforcing-policies-for-github-actions-in-your-enterprise#allow-enterprise-and-select-non-enterprise-actions-and-reusable-workflows) |
+| Billing for premium requests in {% data variables.product.prodname_copilot_short %} | Currently unavailable | [AUTOTITLE](/copilot/managing-copilot/understanding-and-managing-copilot-usage/understanding-and-managing-requests-in-copilot) |
 | {% data variables.product.prodname_github_models %} |  Currently unavailable | [AUTOTITLE](/github-models/about-github-models) |
 | Some features currently in {% data variables.release-phases.public_preview %} or {% data variables.release-phases.private_preview %} | Certain features that are in a preview phase on {% data variables.product.prodname_dotcom_the_website %} may not be available on {% data variables.enterprise.data_residency_site %} | |
 

content/copilot/managing-copilot/understanding-and-managing-copilot-usage/understanding-and-managing-requests-in-copilot.md

@@ -14,6 +14,7 @@ redirect_from:
 
 > [!IMPORTANT]
 > * Billing for premium requests began on June 18, 2025 for all paid {% data variables.product.prodname_copilot_short %} plans, and the request counters were only set to zero for paid plans.
+> * {% data reusables.copilot.data-residency-availability %}
 > * Premium request counters reset on the 1st of each month. See [AUTOTITLE](/copilot/managing-copilot/understanding-and-managing-copilot-usage/monitoring-your-copilot-usage-and-entitlements).
 > * Certain requests may experience rate limits to accommodate high demand. Rate limits restrict the number of requests that can be made within a specific time period.
 

data/reusables/copilot/data-residency-availability.md

@@ -0,0 +1 @@
+Billing for premium requests is **not available** if you use {% data variables.enterprise.data_residency %}. This means premium requests are not counted and you will not be charged for them.