[DX-144] Sync Control API spec with latest Control API source

Brings static/open-specs/control-v1.yaml in line with the Control API
implementation and its generated swagger document:

- Add missing rule target fields: exchange (amqp/external), primarySite
  and provisionedCapacity (postgres outbox and mongodb ingress), watch
  (mongodb ingress), and status on amqp/external and Google Cloud
  Function create schemas
- Add legacy webhook rule type to rule_response for batch-mode rules
  created before the http rule type was introduced
- Add missing endpoints: GET /me/accounts and POST /help, with
  me_accounts, help_request and help_response schemas
- Add inProgress and required fields to account and app stats responses
- Fix namespace schemas: add missing type to conflationEnabled, correct
  batchingInterval description, mark batching and conflation fields
  nullable, and document that mutableMessages requires persisted
- Mark key_response name nullable and align unsupported rule target
  with additionalProperties true
- Point the docs page at the spec's new home in ably/docs

Author: sacOO7

src/pages/docs/platform/account/control-api.mdx

@@ -38,7 +38,7 @@ The Control API limits the number of requests per account and per access token p
 
 ## OpenAPI document <a id="open-api"/>
 
-The OpenAPI document for this API can be found in the Ably OpenAPI Documents [GitHub repository](https://github.com/ably/open-specs). It is not required in order to use Control API, but is provided to you so you may optionally generate your own documentation in the tool of your choice, or use mocking tools such as [Prism](https://stoplight.io/open-source/prism/) to assist in developing your clients.
+The OpenAPI document for this API can be found in the Ably OpenAPI Documents [GitHub repository](https://github.com/ably/docs/tree/main/static/open-specs). It is not required in order to use Control API, but is provided to you so you may optionally generate your own documentation in the tool of your choice, or use mocking tools such as [Prism](https://stoplight.io/open-source/prism/) to assist in developing your clients.
 
 In the [testing with Postman](#postman) section you learn how to import this OpenAPI document into Postman, to enable you to quickly try out Control API.
 
@@ -797,7 +797,7 @@ A convenient way to try out the Control API is by importing the OpenAPI document
 
 ![Postman import dialog](../../../../images/content/screenshots/control-api/postman-import-dialog.png)
 
-3. Click the **Link** tab, and paste in the following URL: `https://raw.githubusercontent.com/ably/open-specs/main/definitions/control-v1.yaml`, then click **Continue**:
+3. Click the **Link** tab, and paste in the following URL: `https://raw.githubusercontent.com/ably/docs/refs/heads/main/static/open-specs/control-v1.yaml`, then click **Continue**:
 
 ![Link to OpenAPI document](../../../../images/content/screenshots/control-api/postman-link.png)