Create missing SCS when creating tag events

With this change we create an SCS event for the commit being tagged if
it is missing and the commit is reachable from one of the branches
that is not blocked. With this change we also log the name of the
tag when we fail to create a CD.

Solves: Jira GER-1688
Solves: Jira GER-1689
Change-Id: I77b5e4ad5600548a4aad824a7f0aec42a09e6d1c
6 files changed
tree: 0a1bd13e1ab326e80cb5c2b321e31be7686b9f2e
  1. src/
  2. BUILD
  3. external_plugin_deps.bzl