Fix Inject-test such that it does NOT have a dependency on inject-events

[SentryMan]

Currently, when inject-test is built, it has a META-INF/services/InjectExtension with an entry for io.avaje.inject.events.spi.ObserverManagerPlugin.

This means that it has hard dependency on inject-events. When events is not present this exception occurs:

java.util.ServiceConfigurationError: ServiceConfiguration io.avaje.inject.spi.InjectExtension: Provider io.avaje.inject.events.spi.ObserverManagerPlugin not found

this pr makes it so that entry is not added to inject-test

[rbygrave]

It seems

We can be explicit here, that helps anyone who hits this issue and is trying to understand it.

Currently, when inject-test is built, it is has a META-INF/services/InjectExtension with an entry for io.avaje.inject.events.spi.ObserverManagerPlugin. This means that it has this implicit dependency on inject-events.

The fix for this issue is to NOT generate that META-INF/services/InjectExtension at all when inject-test is built.