Update foreign table to distant table schema (#5508)

Closes #5069 back-end part

And:
- do not display schemaPendingUpdates status on remote server lists as
this call will become too costly if there are dozens of servers
- (refacto) create foreignTableService

After this is merged we will be able to delete remoteTable's
availableTables column

packages/twenty-server/src/engine/workspace-manager/workspace-migration-runner/workspace-migration-runner.service.ts

@@ -155,6 +155,14 @@ export class WorkspaceMigrationRunnerService {
           `DROP FOREIGN TABLE ${schemaName}."${tableMigration.name}"`,
         );
         break;
+      case WorkspaceMigrationTableActionType.ALTER_FOREIGN_TABLE:
+        await this.alterForeignTable(
+          queryRunner,
+          schemaName,
+          tableMigration.name,
+          tableMigration.columns,
+        );
+        break;
       default:
         throw new Error(
           `Migration table action ${tableMigration.action} not supported`,
@@ -507,4 +515,29 @@ export class WorkspaceMigrationRunnerService {
       COMMENT ON FOREIGN TABLE "${schemaName}"."${name}" IS '@graphql({"primary_key_columns": ["id"], "totalCount": {"enabled": true}})';
     `);
   }
+
+  private async alterForeignTable(
+    queryRunner: QueryRunner,
+    schemaName: string,
+    name: string,
+    columns: WorkspaceMigrationColumnAction[] | undefined,
+  ) {
+    const columnUpdatesQuery = columns
+      ?.map((column) => {
+        switch (column.action) {
+          case WorkspaceMigrationColumnActionType.DROP:
+            return `DROP COLUMN "${column.columnName}"`;
+          case WorkspaceMigrationColumnActionType.CREATE:
+            return `ADD COLUMN "${column.columnName}" ${column.columnType}`;
+          default:
+            return '';
+        }
+      })
+      .filter(Boolean)
+      .join(', ');
+
+    await queryRunner.query(
+      `ALTER FOREIGN TABLE ${schemaName}."${name}" ${columnUpdatesQuery};`,
+    );
+  }
 }