BREAKING CHANGE: Removing remote integration feature (#17001)

## Context
The feature has not been maintained for more than a year and was never
officially launched.
This PR removes its code due to the upcoming refactoring of the
sync-metadata that will break its logic if not handled properly and it
would be too costly for the time being.

TODO:
- remove isRemote from object/field metadata

packages/twenty-server/src/engine/core-modules/auth/types/auth-context.type.ts

@@ -110,10 +110,6 @@ export type PostgresProxyTokenJwtPayload = CommonPropertiesJwtPayload & {
   type: JwtTokenTypeEnum.POSTGRES_PROXY;
 };
 
-export type RemoteServerTokenJwtPayload = CommonPropertiesJwtPayload & {
-  type: JwtTokenTypeEnum.REMOTE_SERVER;
-};
-
 export type JwtPayload =
   | AccessTokenJwtPayload
   | ApiKeyTokenJwtPayload
@@ -123,5 +119,4 @@ export type JwtPayload =
   | TransientTokenJwtPayload
   | RefreshTokenJwtPayload
   | FileTokenJwtPayload
-  | PostgresProxyTokenJwtPayload
-  | RemoteServerTokenJwtPayload;
+  | PostgresProxyTokenJwtPayload;

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -1,7 +1,4 @@
 export enum FeatureFlagKey {
-  IS_AIRTABLE_INTEGRATION_ENABLED = 'IS_AIRTABLE_INTEGRATION_ENABLED',
-  IS_POSTGRESQL_INTEGRATION_ENABLED = 'IS_POSTGRESQL_INTEGRATION_ENABLED',
-  IS_STRIPE_INTEGRATION_ENABLED = 'IS_STRIPE_INTEGRATION_ENABLED',
   IS_UNIQUE_INDEXES_ENABLED = 'IS_UNIQUE_INDEXES_ENABLED',
   IS_JSON_FILTER_ENABLED = 'IS_JSON_FILTER_ENABLED',
   IS_AI_ENABLED = 'IS_AI_ENABLED',