Add Integrations Scenario and Job

This MR adds a new scenario and new job to run tests tagged with :webhook with the Test::Integration::Webhook scenario.

It is a continuation of this MR, and uses Smocker as component which captures webhook event requests.

This MR adds a generic integrations job that will be consumed by orchestrated specs with the "integrations" tag.

These specs will manage container state from within the test, and the intention is to migrate all integrations testing into one job.

It will consumed by this MR