fix: stop sending linkdef events on startup

[connorsmith256]

Feature or Problem

This PR splits processing historical lattice metadata entries into two parts:

• on startup, the host reads all entries out of the bucket and initializes its cache of link defs/claims. It should not publish link def put/deleted events for historical entries
• on startup, the host starts listening to new entries. For new entries, the host should publish link def put/deleted events

Release Information

Next

Consumer Impact

The host should simply emit fewer events on startup

Testing

Unit Test(s)

Acceptance or Integration

Manual Verification

Ran the host, confirmed a bunch of process_entry logs were emitted, but no linkdef_set events were, until I ran wash link put

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