Minor logging changes

a3d521de - Move latest_successful_ref to AutoDeployBranchService

The method was only used directly by that class, and didn't need to exist in the shared BranchCreation module.

7e83cd07 - Add debug logging for missing dev commit

7e0b94d0 - Explicit to_s for Project passed as logger payload

ab30d83b - Log with payload in PassingBuild

ce79d828 - Adjust logging levels for a few messages

bec989ab - Include SemanticLogger in Commits

23048f48 - Normalize payload keys for logging branches/tags

This allows for easier filtering in Elasticsearch when all of the payloads have a name attribute, instead of some having ref, some having tag, and some having branch.

67806103 - Add inspect to BaseProject

This allows us to add a Project object as a payload to SemantLogger without having to explicitly call to_s.