Standard Agent, Role, Role target (#16499)

# Introduction
In this pullrequest have been migrated to the flat standard entities:
Role, Agent and RoleTargets.

## What happens
- Removed createStandardMorph tool util in favor of dynamic typing of
`createMorphOrRelationStandardField`
- Implemented a command to remove standard agents and their role that
has been removed in https://github.com/twentyhq/twenty/pull/16513 also
added a default role target to data manipulator role to the only
remaining agent
- Implemented an agent deleteMany service handler

packages/twenty-server/src/engine/metadata-modules/flat-entity/constant/all-metadata-required-metadata-for-validation.constant.ts

@@ -52,8 +52,11 @@ export const ALL_METADATA_REQUIRED_METADATA_FOR_VALIDATION = {
   role: {},
   roleTarget: {
     role: true,
+    agent: true,
+  },
+  agent: {
+    role: true,
   },
-  agent: {},
   pageLayout: {},
   pageLayoutTab: {
     pageLayout: true,