chore(studio): remove outdated Pipelines feedback button (#51424)

## Problem

The Pipelines header links to an older feedback discussion. The
dashboard's existing Feedback control already captures the current
route.

## Solution

Remove the “Leave feedback” button and its unused URL constant.

| Before | After |
| --- | --- |
| <img width="1932" height="340" alt="32431"
src="https://github.com/user-attachments/assets/ef5f919c-503b-4fcc-9137-90ddeb6c07dd"
/> | <img width="1930" height="350" alt="CleanShot 2026-10-08 at 15 47
38@2x"
src="https://github.com/user-attachments/assets/d44df2a0-8681-4594-9679-148d639d08fd"
/> |

## Review instructions

1. Open a project's Database > Pipelines page at
`/project/<ref>/database/pipelines`.
2. Confirm the header shows the documentation button without “Leave
feedback”.
3. Confirm the diagram and the usage and enable/disable dropdown actions
are unchanged.

apps/studio/components/interfaces/Database/Replication/Replication.constants.ts

@@ -6,5 +6,3 @@ export enum PipelineStatusName {
   STOPPING = 'stopping',
   UNKNOWN = 'unknown',
 }
-
-export const PIPELINES_FEEDBACK_URL = 'https://github.com/orgs/supabase/discussions/39416'

apps/studio/pages/project/[ref]/database/pipelines/index.tsx

@@ -1,6 +1,4 @@
 import { useParams } from 'common'
-import { MessageSquare } from 'lucide-react'
-import { Button } from 'ui'
 import { PageContainer } from 'ui-patterns/PageContainer'
 import {
   PageHeader,
@@ -14,7 +12,6 @@ import { PageSection, PageSectionContent } from 'ui-patterns/PageSection'
 import { GenericTableLoader, ShimmeringLoader } from 'ui-patterns/ShimmeringLoader'
 
 import { Destinations } from '@/components/interfaces/Database/Replication/Destinations'
-import { PIPELINES_FEEDBACK_URL } from '@/components/interfaces/Database/Replication/Replication.constants'
 import { ReplicationDiagram } from '@/components/interfaces/Database/Replication/ReplicationDiagram'
 import { InstanceConfiguration } from '@/components/interfaces/Settings/Infrastructure/InfrastructureConfiguration/InstanceConfiguration'
 import { PipelinesLayout } from '@/components/layouts/DatabaseLayout/PipelinesLayout'
@@ -70,11 +67,6 @@ const DatabasePipelinesPage: NextPageWithLayout = () => {
           </PageHeaderSummary>
 
           <PageHeaderAside>
-            <Button asChild variant="default" icon={<MessageSquare />}>
-              <a href={PIPELINES_FEEDBACK_URL} target="_blank" rel="noreferrer noopener">
-                Leave feedback
-              </a>
-            </Button>
             <DocsButton href={`${DOCS_URL}/guides/database/replication/pipelines`} />
           </PageHeaderAside>
         </PageHeaderMeta>