[Response Ops][Task Manager][PoC] Run tasks as the current user

[JiaweiWu]

Summary

Resolves: #190661

This PR is a proof of concept allowing tasks to be ran scoped as the current user. It accomplishes this by creating an API when the user schedules this task. It will then persist the API key in the task instance which allows the task handler to have access to the user's privileges.

To test:

1. Run yarn start --run-examples
2. Navigate to http://localhost:5601/app/triggersActionsUiExample/task_manager_with_api_key
3. Click on Schedule Task 1 and 2, this will schedule a mock test that is defined in x-pack/platform/plugins/shared/alerting/server/plugin.ts, which prints out the task instance and the scoped clients.
4. Click on Remove to cancel the task, which then cleans up and invalidates the API keys.
5. Reschedule the 2 tasks and click on Remove All Tasks which will bulk remove tasks and invalidate API keys.

Limitation of this approach:

• Because we depend on a request, this would mean every schedule that is tied to a user needs to be triggered using a request. (Unless we have a way of generating an API key without using the request).

[elasticmachine]

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