Include LauncherInterceptor in launcher module declaration

[shartte]

Overview

Fixes junit-team#3561 by including the new LauncherInterceptor service in the module metadata for the launcher JPMS module.
Otherwise in the context of Java Modules, it cannot use ServiceLoader to look up implementations of LauncherInterceptor.

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Definition of Done

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• [-] Change is covered by automated tests including corner cases, errors, and exception handling (NOTE: I do not think there are automated tests for JPMS)
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes