Convert azcagit to use Jobs instead of Apps

[simongottschlag]

This PR will convert azcagit from using a plain App that's up and running all the time and switch over to using a Job that runs on a cron schedule. This forces a couple of other changes as well.

Changes:

• dapr doesn't work anymore, triggering will be handled by the Job type 'Event'
• Since dapr isn't used anymore, a Basic service bus and a queue can be used
• Two subcommands are introduced, reconcile and trigger
• The reconcile subcommand will do what azcagit did before on a schedule, but once
• The Job running the reconcile subcommand will now be called azcagit-reconcile
• Cache for Apps, Jobs, Notifications and Revision will now be stored in CosmosDB (serverless)
• Secret cache is still local, but will only do one lookup per reconcile and deduplicate between apps and jobs

The trigger subcommand will do a few new things:

• It will run as a separate Job and triggered by messages landing on the service bus queue
• When it runs, it will complete the message(s) and then force azcagit-reconcile to run

TODO:

• Use blob storage for AppCache and JobCache
• Come up with something smart around SecretCache (shouldn't store secrets on blob storage)
• Use blob storage together with go-git to store the cloned repository
• Figure out how to handle previous notification event
• Figure out how to handle git lastRevision
• Should all CosmosDB caches use the same client?