feat(connections): add an onDisconnect lifecycle hook to connection providers (#23538)

Platform half of the follow-up to
https://github.com/twentyhq/twenty/pull/22984#discussion_r3673946334.
The Slack app claims a `team_id` on connect and had no way to release
it, because connection providers only had an on-connect hook. Nothing
here is Slack-specific, so it targets `main`. The app side is #23540, on
top of `feat/slack-bot`, and waits on this plus an SDK release.

## What changes

`defineConnectionProvider` accepts `onDisconnectLogicFunction` alongside
`onConnectLogicFunction`. It is stored on
`connectionProvider.onDisconnectLogicFunctionUniversalIdentifier` (fast
instance command `2.26.0_...1785350000000`) and enqueued right after the
`ConnectedAccount` row is deleted, in the disconnecting workspace, with
the same payload as on-connect:

```ts
type OnDisconnectPayload = {
  connectionProviderId: string;
  connectionProviderName: string;
  connectedAccountId: string;
};
```

The `ConnectedAccount` is gone by the time the hook runs, so
`getConnection` no longer resolves. Anything the cleanup needs has to be
in the key-value store, written at connect time and keyed by
`connectedAccountId`. The docs section spells that out, along with the
fact that uninstalling an app drops its connections through a cascade
that never reaches this hook, where `uninstallLogicFunction` is the
right tool instead.

Both dispatches moved into a new
`ConnectionProviderLifecycleHookService`, so
`ConnectionProviderOAuthFlowService` no longer owns hook plumbing and
`ConnectedAccountMetadataService.delete` can reuse it. On-connect
behaviour is unchanged: best effort, never blocks the caller, failures
go to Sentry.

## Tests

- `connection-provider-lifecycle-hook.service.spec.ts`: the on-connect
cases moved over, plus on-disconnect dispatch, no-hook, and
missing-provider cases
- `connection-provider-oauth-flow.service.spec.ts`: now asserts
delegation to the lifecycle hook service
- SDK validation, manifest duplicate-identifier, and manifest to flat
converter specs extended

Server unit tests and typecheck for shared, sdk and server pass locally.

packages/twenty-server/src/database/commands/upgrade-version-command/instance-commands.constant.ts

@@ -130,6 +130,7 @@ import { AddAppTokenSsoExchangeIndexFastInstanceCommand } from './2-25/2-25-inst
 import { AddPageLayoutCascadeDeleteIndexesFastInstanceCommand } from './2-25/2-25-instance-command-fast-1784904030251-add-page-layout-cascade-delete-indexes';
 import { AddChannelWebhookSubscriptionExternalIdIndexesFastInstanceCommand } from 'src/database/commands/upgrade-version-command/2-25/2-25-instance-command-fast-1785173910915-add-channel-webhook-subscription-external-id-indexes';
 import { AddIsHiddenToAgentMessageFastInstanceCommand } from './2-25/2-25-instance-command-fast-1785230296000-add-is-hidden-to-agent-message';
+import { AddOnDisconnectLogicFunctionToConnectionProviderFastInstanceCommand } from 'src/database/commands/upgrade-version-command/2-27/2-27-instance-command-fast-1785810340935-add-on-disconnect-logic-function-to-connection-provider';
 import { AddConnectedAccountHandleProviderIndexFastInstanceCommand } from 'src/database/commands/upgrade-version-command/2-26/2-26-instance-command-fast-1785420705255-add-connected-account-handle-provider-index';
 import { AddOpenRecordInToObjectMetadataFastInstanceCommand } from 'src/database/commands/upgrade-version-command/2-27/2-27-instance-command-fast-1785504900000-add-open-record-in-to-object-metadata';
 import { CreateUserSessionCoreTableFastInstanceCommand } from 'src/database/commands/upgrade-version-command/2-27/2-27-instance-command-fast-1785518325511-create-user-session-core-table';
@@ -266,6 +267,7 @@ export const INSTANCE_COMMANDS = [
   AddPageLayoutCascadeDeleteIndexesFastInstanceCommand,
   AddChannelWebhookSubscriptionExternalIdIndexesFastInstanceCommand,
   AddIsHiddenToAgentMessageFastInstanceCommand,
+  AddOnDisconnectLogicFunctionToConnectionProviderFastInstanceCommand,
   AddConnectedAccountHandleProviderIndexFastInstanceCommand,
   AddOpenRecordInToObjectMetadataFastInstanceCommand,
   CreateUserSessionCoreTableFastInstanceCommand,