Alerting: Allow pausing alerts from provisioning (#62263)
* Allow pausing alerts from provisioning
* Update swagger
* Add IsPaused to provision export endpoints
* Add pause field in sample.yml
* Add exception for reset state in first loop iteration of scheduler if rule is paused
* Update provision definition and swagger docs
* Fix provisioning export tests
* Suggestion: Simplify if condition
* Add more context to a comment
(cherry picked from commit 7a465f42a6)
Co-authored-by: Alex Moreno <alexander.moreno@grafana.com>