GitHub issues public preview cleanup (#35980)

Co-authored-by: Alex Nguyen <150945400+nguyenalex836@users.noreply.github.com>

Author: Michael21107

content/issues/tracking-your-work-with-issues/about-issues.md

@@ -25,8 +25,6 @@ Issues can be created in a variety of ways, so you can choose the most convenien
 
 ## About sub-issues
 
-{% data reusables.issues.release-stage %}
-
 {% data reusables.issues.about-sub-issues %} See [AUTOTITLE](/issues/tracking-your-work-with-issues/using-issues/adding-sub-issues) and [AUTOTITLE](/issues/tracking-your-work-with-issues/using-issues/browsing-sub-issues).
 
 {% endif %}

content/issues/tracking-your-work-with-issues/using-issues/adding-sub-issues.md

@@ -18,8 +18,6 @@ redirect_from:
   - /issues/managing-your-tasks-with-tasklists/using-projects-and-tasklists
 ---
 
-{% data reusables.issues.release-stage %}
-
 You can add sub-issues to an issue to break down larger pieces of work into tasks. Your sub-issues show their relationship to the parent issue allowing you to track your work across {% data variables.product.github %}. Parent issues and sub-issue progress is also available in your {% data variables.projects.projects_v2 %}, allowing you to build views, filter, and group by parent issue.
 
 Your sub-issues can themselves contain sub-issues, allowing you to create full hierarchies of issues that visualize entire projects or pieces of work and show the relationships between your issues.

content/issues/tracking-your-work-with-issues/using-issues/browsing-sub-issues.md

@@ -8,8 +8,6 @@ topics:
   - Project management
 ---
 
-{% data reusables.issues.release-stage %}
-
 {% data reusables.issues.about-sub-issues %}
 
 ## Navigating issue hierarchy

content/issues/tracking-your-work-with-issues/using-issues/filtering-and-searching-issues-and-pull-requests.md

@@ -71,8 +71,6 @@ You can filter issues and pull requests to find:
 
 ## Building advanced filters for issues
 
-{% data reusables.issues.release-stage %}
-
 You can build advanced filters using boolean and nested queries on your repository's issues page. As you type your filter, {% data variables.product.github %} will show available qualifiers, suggest values, and warn when there is a problem with your filter.
 
 ### Using boolean operators
@@ -137,8 +135,6 @@ Once you've [applied labels to an issue or pull request](/issues/using-labels-an
 
 ## Filtering by issue type
 
-{% data reusables.issues.release-stage %}
-
 If your organization uses issue types, you can filter issues for a particular type. You can also type the `type:` qualifier directly into your filter.
 
 {% data reusables.repositories.navigate-to-repo %}