[permissions] Enable permissions V1 for all workspaces (#11172)

Closes https://github.com/twentyhq/core-team-issues/issues/526

(for reminder: 
1. Make defaultRoleId non-nullable for an active workspace
2. Remove permissions V1 feature flag
3. Set member role as default role for new workspaces

About 1.:
An active workspace's defaultRoleId should never be null.
We can't rely on a simple postgres NOT NULL constraint as defaultRoleId
will always be initially null when the workspace is first created since
the roles do not exist at that time.

Let's add a more complex rule to ensure that

About 3.:
In the first phase of our deploy of permissions, we chose to assign
admin role to all existing users, not to break any existing behavior
with the introduction of the feature (= existing users have less rights
than before).

As we deploy permissions to all existing and future workspaces, let's
set the member role as default role for future workspaces.
)

packages/twenty-server/src/modules/workspace-member/query-hooks/workspace-member-pre-query-hook.service.ts

@@ -2,7 +2,6 @@ import { Injectable } from '@nestjs/common';
 
 import { isDefined } from 'twenty-shared/utils';
 
-import { FeatureFlagKey } from 'src/engine/core-modules/feature-flag/enums/feature-flag-key.enum';
 import { FeatureFlagService } from 'src/engine/core-modules/feature-flag/services/feature-flag.service';
 import { SettingPermissionType } from 'src/engine/metadata-modules/permissions/constants/setting-permission-type.constants';
 import {
@@ -33,16 +32,6 @@ export class WorkspaceMemberPreQueryHookService {
     workspaceId: string;
     apiKey?: ApiKeyWorkspaceEntity | null;
   }) {
-    const featureFlagsMap =
-      await this.featureFlagService.getWorkspaceFeatureFlagsMap(workspaceId);
-
-    const isPermissionsEnabled =
-      featureFlagsMap[FeatureFlagKey.IsPermissionsEnabled];
-
-    if (!isPermissionsEnabled) {
-      return;
-    }
-
     if (isDefined(apiKey)) {
       return;
     }