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/workspace-manager/dev-seeder/core/utils/seed-feature-flags.util.ts

@@ -21,21 +21,6 @@ export const seedFeatureFlags = async ({
     .into(`${schemaName}.${tableName}`, ['key', 'workspaceId', 'value'])
     .orIgnore()
     .values([
-      {
-        key: FeatureFlagKey.IS_AIRTABLE_INTEGRATION_ENABLED,
-        workspaceId: workspaceId,
-        value: true,
-      },
-      {
-        key: FeatureFlagKey.IS_POSTGRESQL_INTEGRATION_ENABLED,
-        workspaceId: workspaceId,
-        value: true,
-      },
-      {
-        key: FeatureFlagKey.IS_STRIPE_INTEGRATION_ENABLED,
-        workspaceId: workspaceId,
-        value: true,
-      },
       {
         key: FeatureFlagKey.IS_UNIQUE_INDEXES_ENABLED,
         workspaceId: workspaceId,