Add Azure Front Door URL to Copilot allowlist reference (#59799)

Author: a1exmozz

content/copilot/reference/copilot-allowlist-reference.md

@@ -37,6 +37,7 @@ If your company employs security measures like a firewall or proxy server, you s
 | `https://*.enterprise.githubcopilot.com`[^4]                | API service for {% data variables.product.prodname_copilot_short %} suggestions |
 | `https://*.SUBDOMAIN.ghe.com`                                      | For {% data variables.product.prodname_copilot_short %} users on {% data variables.enterprise.data_residency_site %} |
 | `https://SUBDOMAIN.ghe.com`                                        | For {% data variables.product.prodname_copilot_short %} users on {% data variables.enterprise.data_residency_site %} |
+| `https://copilot-reports-*.b01.azurefd.net`                        | {% data variables.product.prodname_copilot_short %} usage metrics report downloads |
 
 Depending on the security policies and editors your organization uses, you may need to allowlist additional domains and URLs. For more information on specific editors, see [Further reading](#further-reading).