build: remove incremental migration tests

.github/workflows/phpunit-incremental.yml

@@ -1,30 +0,0 @@
-name: PHPUnit Incremental Migration
-
-on:
-  pull_request:
-  push:
-    branches:
-      - master
-
-permissions:
-  contents: read
-  pull-requests: read
-
-concurrency:
-  group: phpunit-incremental-${{ github.head_ref || github.run_id }}
-  cancel-in-progress: true
-
-jobs:
-  phpunit-incremental-v0-14-0:
-    uses: chenasraf/workflows/.github/workflows/nextcloud-phpunit-incremental.yml@nextcloud-latest
-    secrets: inherit
-    with:
-      baseline-version: 'v0.14.0'
-      validation-query: 'SELECT COUNT(*) FROM oc_forum_users'
-
-  phpunit-incremental-v0-22-8:
-    uses: chenasraf/workflows/.github/workflows/nextcloud-phpunit-incremental.yml@nextcloud-latest
-    secrets: inherit
-    with:
-      baseline-version: 'v0.22.8'
-      validation-query: 'SELECT COUNT(*) FROM oc_forum_users'