refactor(config): drop the dead DriverInstanceResilienceStatus table (#524)

The sibling of #521's DriverHostStatus, dead for exactly the same reason. Before this change the
only reference in the entire repo was the DriverInstanceResilienceStatuses DbSet declaration: no
writer, no reader, and the table empty on every deployment.

Its entity doc described two components that were never built — a HostedService sampling the
tracker every ~5 s into this table, and an AdminUI that left-joined it on DriverHostStatus for
display. There is no sampler, that join exists in no razor file, and DriverHostStatus itself was
removed in #521.

Per-cluster mesh Phase 4 also makes the design unbuildable now: AddOtOpcUaConfigDb is gated on the
admin role, so a driver-only node has no ConfigDb connection to write rows with. Any per-node
runtime-status table has this problem.

The live data was never missing — it just does not go through SQL. Resilience counters reach the
AdminUI's DriverStatusPanel as DriverResilienceStatusChanged over the driver-resilience-status
telemetry channel into the in-memory IDriverResilienceStatusStore. Verified consumed: the panel
injects the store, fed by both DriverResilienceStatusBridge (DPS) and TelemetryDialSupervisor
(gRPC).

If breaker HISTORY across a central restart is ever wanted — the one thing the last-value-only
store cannot give — it needs a CENTRAL-side writer fed by that stream, never a driver-node writer.
Keeping an empty table now bought nothing toward that.

Migration DropDriverInstanceResilienceStatusTable; the scaffolder's data-loss warning cannot bite
on a table nothing ever inserted into, and Down() recreates it exactly.

Also corrected: DriverResilienceStatusTracker's doc-comment claimed CurrentInFlight fed
DriverInstanceResilienceStatus.CurrentBulkheadDepth "until the full telemetry observer lands". The
observer landed in Phase 5; the table never had a writer.

Claude-Session: https://claude.ai/code/session_015p7wGqy3YpZNCpDzTpGMKo

tests/Core/ZB.MOM.WW.OtOpcUa.Configuration.Tests/SchemaComplianceTests.cs

@@ -36,7 +36,9 @@ public sealed class SchemaComplianceTests
             // DriverHostStatus was dropped in Gitea #521 — nothing ever wrote a row, and per-cluster
             // mesh Phase 4 made the publisher its entity doc described unbuildable (a driver-only node
             // has no ConfigDb connection). Per-host connectivity now rides DriverHealthChanged to /hosts.
-            "DriverInstanceResilienceStatus",
+            // DriverInstanceResilienceStatus dropped in Gitea #524 — same defect as DriverHostStatus
+            // above: no writer, no reader, and Phase 4 leaves a driver-only node with no ConfigDb to
+            // write from. Live resilience counters ride the driver-resilience-status telemetry channel.
             "LdapGroupRoleMapping",
             // v3 dropped the orphaned EquipmentImportBatch / EquipmentImportRow tables.
             // ScriptedAlarmState was dropped in per-cluster mesh Phase 4 (Task 9) — scripted-alarm