BUGFIX: Fix Workspace Metadata upsert

adjusts `WorkspaceMetadataAndRoleRepository::updateWorkspaceMetadata()` so that it does not fail with

> Failed to update metadata for workspace "workspace-name" (Content Repository "default"): An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'default-workspace-name' for key 'PRIMARY'

Background:

Doctrine DBAL has no support for "upserts" built-in and the [suggested work around](doctrine/dbal#1320 (comment)) had a flaw that lead to the above exception when the incoming data wasn't actually changed (because `$affectedRows` is 0 in this case).
This is fixed simply by issuing a `SELECT` first

Neos.Neos/Classes/Domain/Repository/WorkspaceMetadataAndRoleRepository.php

@@ -253,15 +253,30 @@ public function updateWorkspaceMetadata(ContentRepositoryId $contentRepositoryId
         $data = array_filter([
             'title' => $title,
             'description' => $description,
-        ], fn ($value) => $value !== null);
+        ], static fn ($value) => $value !== null);
 
+        $table = self::TABLE_NAME_WORKSPACE_METADATA;
+        $query = <<<SQL
+            SELECT
+                content_repository_id
+            FROM
+                {$table}
+            WHERE
+                content_repository_id = :contentRepositoryId
+                AND workspace_name = :workspaceName
+        SQL;
         try {
-            $affectedRows = $this->dbal->update(self::TABLE_NAME_WORKSPACE_METADATA, $data, [
-                'content_repository_id' => $contentRepositoryId->value,
-                'workspace_name' => $workspace->workspaceName->value,
-            ]);
-            if ($affectedRows === 0) {
-                $this->dbal->insert(self::TABLE_NAME_WORKSPACE_METADATA, [
+            $rowExists = $this->dbal->fetchOne($query, [
+                'contentRepositoryId' => $contentRepositoryId->value,
+                'workspaceName' => $workspace->workspaceName->value,
+            ]) !== false;
+            if ($rowExists) {
+                $this->dbal->update($table, $data, [
+                    'content_repository_id' => $contentRepositoryId->value,
+                    'workspace_name' => $workspace->workspaceName->value,
+                ]);
+            } else {
+                $this->dbal->insert($table, [
                     'content_repository_id' => $contentRepositoryId->value,
                     'workspace_name' => $workspace->workspaceName->value,
                     'description' => '',

Neos.Neos/Tests/Behavior/Features/ContentRepository/WorkspaceService.feature

@@ -52,6 +52,13 @@ Feature: Neos WorkspaceService related features
       | Title                    | Description | Classification | Owner user id |
       | Some new workspace title |             | ROOT           |               |
 
+  Scenario: Change title of root workspace to the same value
+    When the root workspace "some-root-workspace" with title "some title" and description "some description" is created
+    And the title of workspace "some-root-workspace" is set to "some title"
+    Then the workspace "some-root-workspace" should have the following metadata:
+      | Title      | Description      | Classification | Owner user id |
+      | some title | some description | ROOT           |               |
+
   Scenario: Set title of root workspace without metadata
     When a root workspace "some-root-workspace" exists without metadata
     And the title of workspace "some-root-workspace" is set to "Some new workspace title"
@@ -66,6 +73,13 @@ Feature: Neos WorkspaceService related features
       | Title               | Description                    | Classification | Owner user id |
       | some-root-workspace | Some new workspace description | ROOT           |               |
 
+  Scenario: Change description of root workspace to the same value
+    When the root workspace "some-root-workspace" with title "some title" and description "some description" is created
+    And the description of workspace "some-root-workspace" is set to "some description"
+    Then the workspace "some-root-workspace" should have the following metadata:
+      | Title      | Description      | Classification | Owner user id |
+      | some title | some description | ROOT           |               |
+
   Scenario: Change description of root workspace without metadata
     When a root workspace "some-root-workspace" exists without metadata
     And the description of workspace "some-root-workspace" is set to "Some new workspace description"