Allow specifying Exception as workflow failure types

[jeromepl]

What was changed

Allow using Exception in the workflow_failure_exception_types config option of workers.

Why?

The documentation mentions that using Exception might be useful to allow any error to be considered as a workflow failure:

sdk-ruby/temporalio/lib/temporalio/worker.rb

Lines 347 to 351 in 143e421

	# @param workflow_failure_exception_types [Array<Class<Exception>>] Workflow failure exception types. This is the
	# set of exception types that, if a workflow-thrown exception extends, will cause the workflow/update to fail
	# instead of suspending the workflow via task failure. These are applied in addition to the
	# `workflow_failure_exception_type` on the workflow definition class itself. If {::Exception} is set, it
	# effectively will fail a workflow/update in all user exception cases.

But it was not possible to do so, resulting in a All failure types must classes inheriting Exception error.

[cretz]

Thanks! Yes we support this in other SDKs (basically turning all exceptions into fail-fast workflow failures). Will merge if/when CI passes.

[cretz]

There is a CI issue unrelated to this PR. We will fix it separately and then merge main back into your branch and then merge this. May not be until next week, thanks for your patience.

[cretz]

It looks like there may be CI failures for two things not related to this issue (generated protos have a bit of a new format it seems and Rubocop just released a new check). This is kinda our fault for not using a lock file and always running CI, intentionally, against latest versions. I will fix in #291 before I merge it and then will merge main here (and #285).