remove prefix from journal persistence ID's and tags

[Zen Yui]

Is your feature request related to a problem? Please describe.

• The persistence ID in the journal does not need the chiefofstate|<id> format. We should simplify by removing the chiefofstate| prefix.
• Similarly, our tags unnecessarily have a chiefofstate prefix, and we only apply a single tag per entity to enable sharded projections.

Per the akka persistence docs:

That format of the PersistenceId is not mandatory and only provided as a convenience of a "standardized" format.

Describe the solution you'd like

• Manually invoke the PersistenceId constructor (currently in startnodebehavior)

• Eliminate our tagging method and pass through the shard ID as the tag explicitly in the aggregate root like:

.withTagger(_ => Set(shardIndex.toString))

• provide a data migration that removes the chiefofstate| prefix from all events and tags

Additional context

This will probably help us write journal tools in the future.