Move document title ownership from document to version

Title is now owned by document_versions, following the same pattern as
classification and document_type. The documents.title column is made
nullable with a TODO to drop it. Backend loads title from a
latest_versions CTE for ordering purposes only. The frontend resolves
title from the latest version, and DocumentTitleForm now operates on
DocumentVersion using UpdateDocumentVersion mutation.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/server/api/console/v1/schema.graphql

@@ -2562,7 +2562,6 @@ type Evidence implements Node {
 
 type Document implements Node {
     id: ID!
-    title: String!
     description: String
     currentPublishedMajor: Int
     currentPublishedMinor: Int
@@ -4676,8 +4675,6 @@ input CreateDocumentInput {
 
 input UpdateDocumentInput {
     id: ID!
-    title: String
-    content: String
     trustCenterVisibility: TrustCenterVisibility
     defaultApproverIds: [ID!]
 }
@@ -5945,6 +5942,7 @@ input DeleteDraftDocumentVersionInput {
 
 input UpdateDocumentVersionInput {
     documentVersionId: ID!
+    title: String
     content: String
     classification: DocumentClassification
     documentType: DocumentType