Diagnosing unexpected dependencies in the GitHub Dependency Graph can
be difficult. In order to aid with diagnosis, the `dependency-submission`
action will now save each dependency-graph file as a workflow artifact.
If this is undesirable, the prior behaviour can be restored by explicitly setting
`dependency-graph: generate-and-submit`.
Fixes#519
While `setup-gradle` must wait until the end of job to submit all of the generated
graphs, the `dependency-submission` action will not save/upload the generated graph
immediately, in the same step where it is generated.
Now, a `dependency-submission` step will trigger a dependency-graph
generation, even if it follows a `setup-gradle` step in the workflow.
Similarly, a `setup-gradle` step with `dependency-graph` configured
will function as expected even if it follows a `setup-gradle` step.
Instead of being a thin wrapper over `setup-gradle`, the `dependency-submission`
action is now a fully-fledged action sharing implementation with `setup-gradle`.
