Fix warnings in jface.tests

* Remove redundant type arguments
* Remove redundant implements
* Enable save actions to automate some of that work for the future

Change-Id: I0a5ea194e2b281ef08605078c2f842c692269430
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.text/+/185931
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
3 files changed