spinnaker: "Override default timeout" for pipeline execution doesn't work

Issue Summary:

Some of my pipelines takes a lot of time (more than 30 min by default, and it is OK for me). This pipeline executions are always marked as “Failed”. When I try use checkbox "Override default timeout ( 30 minutes ) ": Pipeline executions fails again (sometimes faster):

This behaviour does not depend on manifests size.

Cloud Provider(s):

Kubernetes GKE

Environment:

Spinnaker 1.14.7 deployed to Kubernetes (V2) GKE cluster via halyard (the same behaviour was in previous version spinnaker too)

Feature Area (if this issue is UI/UX related, please tag @spinnaker/ui-ux-team):

Pipeline executions