Enable GitHub Enterprise Server 3.13 release candidate on GitHub Docs (#50165)

Co-authored-by: Isaac Brown <101839405+isaacmbrown@users.noreply.github.com>
Co-authored-by: Steve Guntrip <stevecat@github.com>
Co-authored-by: Felicity Chapman <felicitymay@github.com>
Co-authored-by: isaacmbrown <isaacmbrown@github.com>
Co-authored-by: docs-bot <77750099+docs-bot@users.noreply.github.com>
Co-authored-by: Peter Bengtsson <peterbe@github.com>
Co-authored-by: Pallavi <96553709+pallsama@users.noreply.github.com>

data/reusables/files/add-file.md

@@ -1,4 +1,4 @@
-{% ifversion code-search-code-view %}
+{% ifversion code-view-ui %}
 1. Above the list of files, select the **Add file** {% octicon "triangle-down" aria-label="The downwards-facing triangle icon" %} dropdown menu, then click {% octicon "plus" aria-label="The plus sign icon" %} **Create new file**.
 
    Alternatively, you can click {% octicon "plus" aria-label="The plus sign icon" %} in the file tree view on the left.

data/reusables/files/preview_change.md

@@ -1,4 +1,4 @@
-{% ifversion code-search-code-view  %}
+{% ifversion code-view-ui  %}
 1. Above the new content, click **Preview**.
 
    ![Screenshot of a file in edit mode. Above the file's contents, a tab labeled "Preview" is outlined in dark orange.](/assets/images/help/repository/edit-readme-preview-changes.png)

data/reusables/files/write_commit_message.md

@@ -1,4 +1,4 @@
-{% ifversion code-search-code-view %}
+{% ifversion code-view-ui %}
 1. Click **Commit changes...**
 {% endif %}
 1. In the "Commit message" field, type a short, meaningful commit message that describes the change you made to the file. You can attribute the commit to more than one author in the commit message. For more information, see "[AUTOTITLE](/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors)."