Upgrade healthcheck to supply broken build links

[adamfarley]

The Current Situation

The build healthcheck system provides a daily report (in Slack) on the status of the overnight builds. Each OpenJDK project (Temurin, Dragonwell, etc) has its own "Details" button, which takes you from the report to a list of the pipelines that contributed to the report's information.

The Problem

If a project I'm interested in has build failures, I need to read through pages of output to identify the pipelines with failures, and I need to open all of those pipeline links to find the details of all the failures.

The Proposed Solution

I propose that "Details" links to a unified list of all the failing builds affecting that project's overnight builds' status. May be as simple as putting a list of build failure URLs at the bottom of the healthcheck job that "Details" links to.

Example:

FAILING BUILDS:

JDK Version	Platform	Link
JDK8	AIX	https://jenkins.com/abcdefg
JDK20	zLinux	https://jenkins.com/hijklmnop