Downgrade DataPlaneInstanceStore

# Feature Request

Since The dataplanes are now handle without a state machine we should remove the lease stuff from the store as well.

## Which Areas Would Be Affected?

_e.g., DPF, CI, build, transfer, etc._

## Why Is the Feature Desired?

_Are there any requirements?_

## Who will sponsor this feature?

_Please @-mention the committer that will sponsor your feature_.

## Solution Proposal

_If possible, provide a (brief!) solution proposal._

Start by locating DataPlaneInstanceStore and tracing how its lease handling connects to the data-plane state machine. Confirm which lease-related behavior is now obsolete, then remove it while preserving the store's remaining responsibilities and run the relevant data-plane tests.

Written by the indexing model from the issue text.