Set EventType for push event in ParsePayload of Bitbucket server

set EvnetType for push event in ParsePayload of Bitbucket
server as done in other git provider e.g. Github, Gitea etc.

Signed-off-by: Zaki Shaikh <zashaikh@redhat.com>

Author: zakisk

pkg/provider/bitbucketserver/parse_payload.go

@@ -155,7 +155,8 @@ func (v *Provider) ParsePayload(_ context.Context, _ *params.Run, request *http.
 		}
 		v.pullRequestNumber = e.PullRequest.ID
 	case *types.PushRequestEvent:
-		processedEvent.TriggerTarget = "push"
+		processedEvent.TriggerTarget = triggertype.Push
+		processedEvent.EventType = triggertype.Push.String()
 		processedEvent.Organization = e.Repository.Project.Key
 		processedEvent.Repository = e.Repository.Slug
 		processedEvent.SHA = e.Changes[0].ToHash