…enok-busuu)

This PR was merged into the 6.3 branch.

Discussion
----------

[Notifier] Allow to update Slack messages

Update existing SlackTransport to allow message updates. Because chat.update API method only allows channel ids, this PR also includes updates to SentMessage

| Q             | A
| ------------- | ---
| Branch?       | 6.2
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | Fix #47274
| License       | MIT
| Doc PR        | symfony/symfony-docs#17214

This pull request allows to update slack messages, for example to keep entity statuses up-to-date:
```php
// On entity creation
$message = sprintf('Entity #%s (%s)', $entity->getId(), $entity->getStatus());
$sentMessage = $this->chatter->send(new ChatMessage($message));

// On status changes
$message = sprintf('Entity #%s (%s)', $entity->getId(), $entity->getStatus());
$this->chatter->send(new ChatMessage($message, new UpdateMessageSlackOptions($sentMessage->getFullMessageId())));
```

Commits
-------

e410909 [Notifier] Allow to update Slack messages

…reguiluz)

This PR was squashed before being merged into the 6.3 branch.

Discussion
----------

[Notifier] Add docs about updating Slack messages

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

These are the docs created by `@maxim`-dovydenok to document this feature in symfony/symfony-docs#17214

Commits
-------

6f72d4f [Notifier] Add docs about updating Slack messages