Data changes to prepare for workspaceMember page (#10439)

Workspace Member will get their own record page in the future.

This PR lays backend changes to prepare for this:
- Settings most fields on WorkspaceMember as system fields
- Renaming workspaceMember/workspaceMemberId to
forWorkspaceMember/forWorkspaceMemberId as it conflicts with the morph
relationship, if we want to be able to add a workspace member as
favorite

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

packages/twenty-front/src/modules/activities/tasks/hooks/__tests__/useCompleteTask.test.tsx

@@ -91,6 +91,7 @@ const mocks: MockedResponse[] = [
                   createdAt
                   deletedAt
                   favoriteFolderId
+                  forWorkspaceMemberId
                   id
                   noteId
                   opportunityId
@@ -104,7 +105,6 @@ const mocks: MockedResponse[] = [
                   workflowId
                   workflowRunId
                   workflowVersionId
-                  workspaceMemberId
                 }
               }
             }