Correlations: Add CreateCorrelation HTTP API (#51630)

* Correlations: add migration

* Correlations: Add CreateCorrelation API

* Correlations: Make correlations work with provisioning

* Handle version changes

* Fix lining error

* lint fixes

* rebuild betterer results

* add a UID to each correlation

* Fix lint errors

* add docs

* better wording in API docs

* remove leftover comment

* handle ds updates

* Fix error message typo

* add bad data test

* make correlations a separate table

* skip readonly check when provisioning correlations

* delete stale correlations when datasources are deleted

* restore provisioned readonly ds

* publish deletion event with full data

* generate swagger and HTTP API docs

* apply source datasource permission to create correlation API

* Fix tests & lint errors

* ignore empty deletion events

* fix last lint errors

* fix more lint error

* Only publish deletion event if datasource was actually deleted

* delete DS provisioning deletes correlations, added & fixed tests

* Fix unmarshalling tests

* Fix linting errors

* Fix deltion event tests

* fix small linting error

* fix lint errors

* update betterer

* fix test

* make path singular

* Revert "make path singular"

This reverts commit 420c3d315e.

* add integration tests

* remove unneeded id from correlations table

* update spec

* update leftover references to CorrelationDTO

* fix tests

* cleanup tests

* fix lint error

pkg/services/sqlstore/datasource.go

@@ -134,13 +134,15 @@ func (ss *SQLStore) DeleteDataSource(ctx context.Context, cmd *datasources.Delet
 		}
 
 		// Publish data source deletion event
-		sess.publishAfterCommit(&events.DataSourceDeleted{
-			Timestamp: time.Now(),
-			Name:      cmd.Name,
-			ID:        cmd.ID,
-			UID:       cmd.UID,
-			OrgID:     cmd.OrgID,
-		})
+		if cmd.DeletedDatasourcesCount > 0 {
+			sess.publishAfterCommit(&events.DataSourceDeleted{
+				Timestamp: time.Now(),
+				Name:      ds.Name,
+				ID:        ds.Id,
+				UID:       ds.Uid,
+				OrgID:     ds.OrgId,
+			})
+		}
 
 		return nil
 	})