Refactor WorkspaceMemberDto transpilation (#12110)

# Introduction

In a nutshell this PR introduces a `workspaceMemberEntity` to
`workspaceMemberDto` transpilation which was not done but commented as
`// TODO` across the `user resolver`.
Also passed on the `Roles` and `UserWorkspacePermissions` transpilation
We now also compute the roles for the `workspaceMember` resolver ( not
only the `workspaceMembers` )
Some refactor

In the following days about to create a PR that introduces integration
testing on the user resolver

## Conclusion
As always any suggestions are more than welcomed ! Please let me know !

## Misc

Following https://github.com/twentyhq/twenty/pull/11914

closing https://github.com/twentyhq/core-team-issues/issues/1011

packages/twenty-server/src/engine/metadata-modules/role/dtos/user-workspace-permissions.dto.ts

@@ -0,0 +1,6 @@
+import { UserWorkspace } from 'src/engine/core-modules/user-workspace/user-workspace.entity';
+
+export type UserWorkspacePermissionsDto = Pick<
+  UserWorkspace,
+  'objectPermissions' | 'settingsPermissions' | 'objectRecordsPermissions'
+>;