Allow workflows listing in MCP (#22013)

This resolves https://github.com/twentyhq/twenty/issues/21986

Add `list_workflows `MCP tool

Workflow objects are excluded from the generic database CRUD tools
exposed via MCP, which meant the only way to list workflows was through
a direct API call.

This adds a `list_workflows `tool to the `WorkflowToolProvider`, making
it available via MCP alongside the existing workflow builder tools. It
supports optional filtering by status (`DRAFT`, `ACTIVE`, `DEACTIVATED`)
and pagination (`limit`/`offset`). The status filter uses an
array-membership predicate (`ANY`) since `statuses `is a multi-value
field.

---------

Co-authored-by: Souheyl Gouadria <souheyl.gouadria@medius.com>
Co-authored-by: Etienne <45695613+etiennejouan@users.noreply.github.com>

packages/twenty-server/src/engine/api/mcp/utils/build-mcp-server-instructions.util.ts

@@ -24,7 +24,7 @@ export const buildMcpServerInstructions = (
     ``,
     `Non-CRUD tools — use learn_tools for schemas:`,
     `  ACTION:           http_request | send_email | draft_email | navigate_app | code_interpreter | search_help_center`,
-    `  WORKFLOW:         create_complete_workflow | create/update/delete_workflow_version_step | activate/deactivate_workflow_version`,
+    `  WORKFLOW:         list_workflows | create_complete_workflow | create/update/delete_workflow_version_step | activate/deactivate_workflow_version | list_workflow_runs | get_workflow_run | get_workflow_current_version`,
     `  METADATA:         get/create/update/delete_object_metadata | get/create/update/delete_field_metadata`,
     `                     Both GET tools return system items as compact summaries by default — keep that default for listing/inspecting; only set includeFullSystemObjects / includeFullSystemFields=true when you specifically need a system item's full configuration`,
     `  VIEW:             get_views | get_view_query_parameters | create/update/delete_view | manage view fields, filters, sorts`,