Fully enable configuration cache test

[voidzcy]

The osdetector plugin version 1.7.0 now should be compliant with configuration cache. So removing flags for ignoring configuration cache problems in tests. Java build is fully compliant. Android build still has one problem, but the problem seems to be on the AGP side.

Configuration cache problems found in this build.

1 problem was found storing the configuration cache.
- Plugin 'com.android.internal.application': registration of listener on 'TaskExecutionGraph.addTaskExecutionListener' is unsupported
  See https://docs.gradle.org/6.7/userguide/configuration_cache.html#config_cache:requirements:build_listeners

Caused by: org.gradle.api.InvalidUserCodeException: Listener registration 'TaskExecutionGraph.addTaskExecutionListener' by org.gradle.execution.taskgraph.DefaultTaskExecutionGraph@55581730 is unsupported.
	at org.gradle.configurationcache.initialization.DefaultConfigurationCacheProblemsListener.onBuildScopeListenerRegistration(ConfigurationCacheProblemsListener.kt:88)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.event.DefaultListenerManager$ListenerDetails.dispatch(DefaultListenerManager.java:398)
	at org.gradle.internal.event.DefaultListenerManager$ListenerDetails.dispatch(DefaultListenerManager.java:380)
	at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:61)
	at org.gradle.internal.event.DefaultListenerManager$EventBroadcast$ListenerDispatch.dispatch(DefaultListenerManager.java:368)
	at org.gradle.internal.event.DefaultListenerManager$EventBroadcast.dispatch(DefaultListenerManager.java:179)
	at org.gradle.internal.event.DefaultListenerManager$EventBroadcast.dispatch(DefaultListenerManager.java:153)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at com.sun.proxy.$Proxy22.onBuildScopeListenerRegistration(Unknown Source)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph.notifyListenerRegistration(DefaultTaskExecutionGraph.java:265)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph.addTaskExecutionListener(DefaultTaskExecutionGraph.java:221)

So still keep org.gradle.unsafe.configuration-cache-problems=warn for Android build test.

[voidzcy]

Update: AGP's issue seems have been fixed in newer releases. Use 4.2.0-beta04 (which is the newest 4.2 release) and we can fully get rid of all conf cache problems.

[voidzcy]

It turns out build-tool 30.0.2 hasn't been officially released for Travis. So lower AGP version to 4.2.0-alpha10, it can also work.