feat: NMv3: allow storing different test results

[jstuczyn]

Kind-tagged test types and per-kind orchestrator storage

Branch 5 of the NMv3 liveness stack, based on feat/nmv3-announce-identity. Lands task groups 3 (shared request/response types) and 4 (orchestrator storage + migration 03) of network-monitor-liveness-tests.

No new behaviour is switched on: the orchestrator still only ever assigns mixnode stress tests, now over a schema and a set of wire types that can express the other kinds.

Shared types (group 3)

• TestKind (stress / liveness) tags every assignment, run and submission stream.
• TestRunAssignment becomes kind-and-role tagged: MixnodeStress (one target), MixnodeLiveness and GatewayLiveness (a wave, homogeneous in role). "No work" stays an absent assignment; an empty wave is never emitted.
• Results carry run-level facts (kind, time_taken, error) plus one InterfaceMeasurement per ExercisedInterface exercised (mix_forwarding / client_ingest / client_delivery), so a gateway's healthy ingest with a dead delivery stays distinguishable from a uniformly half-lossy node.
• nym-api side: liveness batch endpoint constant, LivenessTestBatchSubmission mirroring the stress envelope, and StressTestBatchSubmissionResponse becomes an alias of a shared BatchSubmissionResponse.

Orchestrator storage (group 4)

• Migration 03: node_test_state keyed (node_id, test_kind, tested_role) holds staleness, the last run and the address rotation pointer; testrun_measurement holds per-interface counts under testrun; submission_watermark replaces the single metadata value; testrun_in_progress gains expires_at, test_kind, tested_role; nym_node loses its two test pointers and gains clients_ws_port.
• The insert path is now one transaction: run row, measurement rows, work-state upsert, in-flight lock release.
• In-flight eviction compares each row's own expires_at instead of a cutoff derived from one global timeout, so kinds with different lease budgets expire on their own schedules.

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Project	Deployment	Actions	Updated (UTC)
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