Common - Remove feature flag (#15371)

To be done in an other PR, move graphql-query-runner handlers in
common-api-query-runner folder (+ renaming + typing improvments)


Fixes : 
- totalCount on findMany (Rest)
- getAllSelectedFields did not handle composite field (Rest)
- issue with endCursor (Rest)
- args processing for updateOne and createOne (Rest + Gql)
- fix findDuplicates (Gql)

packages/twenty-server/src/engine/twenty-orm/entity-manager/workspace-entity-manager.spec.ts

@@ -142,7 +142,6 @@ describe('WorkspaceEntityManager', () => {
         IS_PUBLIC_DOMAIN_ENABLED: false,
         IS_EMAILING_DOMAIN_ENABLED: false,
         IS_DYNAMIC_SEARCH_FIELDS_ENABLED: false,
-        IS_COMMON_API_ENABLED: false,
         IS_WORKFLOW_RUN_STOPPAGE_ENABLED: false,
       },
       eventEmitterService: {
@@ -174,7 +173,6 @@ describe('WorkspaceEntityManager', () => {
         IS_PUBLIC_DOMAIN_ENABLED: false,
         IS_EMAILING_DOMAIN_ENABLED: false,
         IS_DYNAMIC_SEARCH_FIELDS_ENABLED: false,
-        IS_COMMON_API_ENABLED: false,
       },
       permissionsPerRoleId: {},
     } as WorkspaceDataSource;