Use run configuration providers or similar to generate executor actions in BUILD files

[Tatskaari]

Currently we generate actions to create run configurations manually but there's a whole mechanism for this in Intellij. The way we do it requires using cached information about the build targets in the file. This can get out of date as the file is updated.

The ExecutorAction code tries to generate actions for each executor for any run configurations in that context. These run configurations are provided by RunConfigurationProviders. We should be able to hook into this mechanism to generate the various configurations however it's not clear how to restrict the executors that are valid for each configuration.