WIP: Stop allowing allow_failure on review apps

What does this MR do?

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides

Availability and Testing

These changes should improve the confidence that we will not allow breaking changes to CNG and the GitLab Helm Chart. The trade-off is that we can no longer ignore failures that may be dependent on changes that are required for helm charts. This risk should be taken into consideration if a change in the product also needs to have a required change to our helm charts.