Add review-app e2e test failure notifications for master runs

What does this MR do and why?

Add failure notifications for review-app tests.

Closes: Add slack notification for review-app test fail... (gitlab-org/quality/quality-engineering/team-tasks#1473 - closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Test run: https://gitlab.com/gitlab-org/gitlab/-/pipelines/659154829