Update product name to reflect current branding (#41624)

Co-authored-by: Laura Coursen <lecoursen@github.com>

data/reusables/enterprise_deprecation/deprecation_details.md

@@ -1,2 +1,2 @@
-No patch releases will be made, even for critical security issues. For better performance, improved security, and new features, <a href="/enterprise/admin/guides/installation/upgrading-github-enterprise/">upgrade to the latest version of GitHub Enterprise</a>.
+No patch releases will be made, even for critical security issues. For better performance, improved security, and new features, <a href="/admin/monitoring-managing-and-updating-your-instance/updating-the-virtual-machine-and-physical-resources/upgrading-github-enterprise-server">upgrade to the latest version of GitHub Enterprise Server</a>.
 For help with the upgrade, <a href="https://enterprise.github.com/support">contact GitHub Enterprise support</a>.

data/reusables/enterprise_deprecation/version_was_deprecated.md

@@ -1 +1 @@
-This version of GitHub Enterprise was discontinued on
+This version of GitHub Enterprise Server was discontinued on

data/reusables/enterprise_deprecation/version_will_be_deprecated.md

@@ -1 +1 @@
-This version of GitHub Enterprise will be discontinued on
+This version of GitHub Enterprise Server will be discontinued on

tests/fixtures/data/reusables/enterprise_deprecation/deprecation_details.md

@@ -1,2 +1,2 @@
-No patch releases will be made, even for critical security issues. For better performance, improved security, and new features, <a href="/enterprise/admin/guides/installation/upgrading-github-enterprise/">upgrade to the latest version of GitHub Enterprise</a>.
+No patch releases will be made, even for critical security issues. For better performance, improved security, and new features, <a href="/admin/monitoring-managing-and-updating-your-instance/updating-the-virtual-machine-and-physical-resources/upgrading-github-enterprise-server">upgrade to the latest version of GitHub Enterprise Server</a>.
 For help with the upgrade, <a href="https://enterprise.github.com/support">contact GitHub Enterprise support</a>.

tests/fixtures/data/reusables/enterprise_deprecation/version_was_deprecated.md

@@ -1 +1 @@
-This version of GitHub Enterprise was discontinued on
+This version of GitHub Enterprise Server was discontinued on

tests/fixtures/data/reusables/enterprise_deprecation/version_will_be_deprecated.md

@@ -1 +1 @@
-This version of GitHub Enterprise will be discontinued on
+This version of GitHub Enterprise Server will be discontinued on