Fix group epics RSS feed

Issue: Fix group work items for RSS feed (#579281)

What does this MR do and why?

Problem

The group -> epics RSS feed is currently broken as the RSS feed only returns project level issues and excludes all group level work items even for group -> epics. This is also a problem on the consolidated list RSS feed as that also excludes all group level work items.

This is not the expected behaviour for the group epics/consolidated list RSS feed since it should show epics which are group level items.

The changes introduced in this MR:

• Adds support for group work items in the rss feed
• Adds type[] filter to the RSS link according to the page (issue/epic), so the RSS feed shows the correct filtered results

References

Screenshots or screen recordings

Before	After
Screen_Recording_2025-11-10_at_11.12.23_AM	Screen_Recording_2025-11-10_at_11.24.55_AM

Work Items (Consolidated List)

Before:

<title>Product Planning work items</title>
<link href="http://gdk.test:3000/groups/product-planning/-/work_items" rel="alternate" type="text/html"/>
<id>http://gdk.test:3000/groups/product-planning/-/work_items</id>
<updated>2025-10-15T13:12:33Z</updated>
<entry>
  <title>some new work item</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>top level proejct 2 issue</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>sub sub group project issue 1</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>subgroup issue 2</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>Top level proj issue #1</title>
  <work_item_type>Issue</work_item_type>
</entry>
</feed>

After:

<title>Product Planning work items</title>
<link href="http://gdk.test:3000/groups/product-planning/-/work_items" rel="alternate" type="text/html"/>
<id>http://gdk.test:3000/groups/product-planning/-/work_items</id>
<updated>2025-10-15T13:12:33Z</updated>
<entry>
  <title>some new work item</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>top level proejct 2 issue</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>sub-sub-sub-sub-epic</title>
  <work_item_type>Epic</work_item_type>
</entry>
<entry>
  <title>sub-sub-sub-epic</title>
  <work_item_type>Epic</work_item_type>
</entry>
<entry>
  <title>subgroup epic 1</title>
  <work_item_type>Epic</work_item_type>
</entry>
<entry>
  <title>sub sub group project issue 1</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>sub sub group epic 1</title>
  <work_item_type>Epic</work_item_type>
</entry>
<entry>
  <title>subgroup issue 2</title>
  <work_item_type>Issue</work_item_type>
</entry>
<entry>
  <title>Top level proj issue #1</title>
  <work_item_type>Issue</work_item_type>
</entry>
</feed>

How to set up and validate locally

• Create some issues and epics for a group
• Go to group issues/ group epics and click on the more actions button (3 dots) top right corner and select Subscribe to RSS
• Confirm that the RSS feed only contains the appropriate items (issues/epics) in the feed respectively
• Turn on FF: work_item_planning_view
• Then navigate to group -> work items (consolidated list) and subscribe to RSS. Confirm that the feed contains both group and project level work items (issues + epics)

MR acceptance checklist

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