* Annotations: Makes various annotation and alert calls cancelable
Fixes #21943

* Refactor: Uses backendSrv.get method with requestId instead

* Update public/app/features/annotations/annotations_srv.ts

Co-Authored-By: Marcus Efraimsson <marcus.efraimsson@gmail.com>

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>