Rework git tag workflow

[tsaucier-sf]

Right now, the Tag workflow is using the sf-arc-ci PAT to tag the repo and kick off a new workflow for docker builds. This needs to be update to use the GH Actions GITHUB_TOKEN to avoid having to manage this PAT long term. With Action tokens, though, we cannot chain the workflows together. The tag step will need to push the update tag value to SSM where the downstream dependent workflows will be able to pick it up and use for the different jobs.