Add 4.39 recipe for sonata-project/admin-bundle using PHP routing (#1993)

Symfony 8.0 removed XmlFileLoader support for routing (deprecated in 7.4).
The PHP routing file sonata_admin.php was introduced in SonataAdminBundle 4.39,
so a new recipe version is required rather than modifying the existing 4.0 recipe.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

sonata-project/admin-bundle/4.39/config/packages/sonata_admin.yaml

@@ -0,0 +1,10 @@
+sonata_admin:
+    title: 'Sonata Admin'
+    dashboard:
+        blocks:
+            - { type: sonata.admin.block.admin_list, position: left }
+
+sonata_block:
+    blocks:
+        sonata.admin.block.admin_list:
+            contexts: [admin]

sonata-project/admin-bundle/4.39/config/routes/sonata_admin.yaml

@@ -0,0 +1,9 @@
+admin_area:
+    resource: "@SonataAdminBundle/Resources/config/routing/sonata_admin.php"
+    type: php
+    prefix: /admin
+
+_sonata_admin:
+    resource: .
+    type: sonata_admin
+    prefix: /admin

sonata-project/admin-bundle/4.39/manifest.json

@@ -0,0 +1,9 @@
+{
+    "bundles": {
+        "Sonata\\AdminBundle\\SonataAdminBundle": ["all"]
+    },
+    "copy-from-recipe": {
+        "config/": "%CONFIG_DIR%/",
+        "src/": "%SRC_DIR%/"
+    }
+}