Set `CS_DEFAULT_BRANCH_IMAGE` in Auto DevOps template
What does this MR do and why?
Describe in detail what your merge request does and why.
By default, container scanning assumes that the image naming convention
stores any branch-specific identifiers in the image tag rather than the
image name. Auto DevOps will use a default naming convention of
$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG:$CI_COMMIT_SHA, where the ref
slug typically refers to the branch name. This means that
vulnerabilities are not correctly correlated across branches. This
change adds CS_DEFAULT_BRANCH_IMAGE to the Auto DevOps template, which
allows images built with the default values to be correctly correlated
across branches. If the default values are changed, then
CS_DEFAULT_BRANCH_IMAGE will need to be changed as well.
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