Implement graphql mutation node for delete lead in bulk

[susilnem]

Problem Statement

The 'lead bulk delete' features uses a Rest API.

Acceptance Criteria

The 'Lead' feature works with a graphql mutation.

Existing

server/apps/lead/views.py

Lines 257 to 265 in bbfdef2

	@action(
	detail=False,
	methods=['post'],
	url_path='bulk-delete',
	)
	def bulk_delete(self, request, project_id, version=None):
	lead_ids = request.data.get('leads', [])
	Lead.objects.filter(project_id=project_id, id__in=lead_ids).delete()
	return response.Response(status=status.HTTP_204_NO_CONTENT)

The existing api doesnot contain any Serializer.

Rest Framework urls

method: POST
url: api/v1/project/<projectID>/leads/bulk-delete/
request payload: {
	"leads": ["72","43"]
}

Purposed

mutation MyMutation ($projectId: ID! $input: [ID!]) {
              project(id: $projectId) {
                leadBulk(deleteIds: $input) {
                    errors
                    deletedResult : BulkLead
                }
              }
            }