Rebuild workflows

[danielrbradley]

• Remove pulumictl - set version explicitly in make and workflow.
• Can't publish pre-release versions for now because syntax varies per language
• We need have something like pulumictl but which just reformats versions per language - not interacting with git.
• Make build the default makefile target
• Add workflow options to disable individual publish steps
• Default local builds to 0.0.1
• Remove unshallow for tags
• Disable old release working on prerelease tag pushes
• For backward compatibility, add tag workflow to invoke new publish workflow
• Use mock actions until we've tested fully