LegacyPayload was a hint used exclusively by the KV store to decide
how to serialize and deserialize the hop payload (legacy format vs
TLV). The SQL store does not serialize hop data at all — every hop
field is persisted natively in its own column — so this flag has no
meaning there and is never stored.
Clear LegacyPayload for all hops inside normalizePaymentForCompare so
that deep-equality checks between KV and SQL payments succeed even when
the KV source data carries LegacyPayload=true.
A dedicated test (TestMigrationLegacyPayloadNormalized) is added to
verify that a payment with LegacyPayload=true hops migrates and
compares correctly.
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