Support custom `junit-platform.properties` location

[sormuras]

At the moment, the JUnit Platform properties are loaded from the first (and sole) resource named junit-platform.properties available via the ClassLoader resource-loading facility.

Internally, the JUnit Platform Launcher already supports by-passing this logic by providing an explicit location of a junit-platform.properties file or stream.

Deliverables

• Introduce a new launcher system property, like junit.platform.properties.location, that lets users specify an alternate location of the JUnit Platform properties file to load.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Given the limited bandwidth of the team, it will be automatically closed if no further activity occurs. Thank you for your contribution.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Given the limited bandwidth of the team, it will be automatically closed if no further activity occurs. Thank you for your contribution.