feat(dcl): move the OPC UA client to OPC Foundation SDK 2.0.1 (#125)

OPCFoundation.NetStandard.Opc.Ua.Client and the test-only .Server move
1.5.378.182 -> 2.0.1, the version OtOpcUa master runs (lmxopcua#782; #799
and #801 closed). Transitive Core/Core.Types/Types/Configuration/
Security.Certificates resolve to 2.0.1.

API breaks fixed in the DCL adapter:
- Built-in types are immutable structs (Variant, DataValue, NodeId,
  LocalizedText, StatusCode, ArrayOf<T>). New OpcUaValueBoundary restores
  the SDK 1.5 CLR shapes for every read, subscription and alarm-event
  value (byte[], UTC DateTime with no-timestamp = MinValue, Guid,
  detached arrays) and builds write variants with SDK 1.5's
  new Variant(object) semantics (byte[] = ByteString scalar).
- StatusCodes members are no longer constants: switches/patterns over
  them (verify-outcome mapping, connection-level classification,
  BadResourceUnavailable) match by value.
- CertificateIdentifier no longer caches a certificate and the
  CertificateValidator/CertificateValidation event is gone: the
  configuration's CertificateManager owns trust lists and the loaded
  application certificate and is disposed with the session; auto-accept
  and the verify probe's capture-and-reject use AcceptError.
- new UserIdentity(X509Certificate2) is gone: X509 user identities use
  X509IdentityTokenHandler with an on-demand PFX provider (still fails
  fast on a missing file/key).
- DefaultSessionFactory takes the telemetry context; collections are
  ArrayOf<T>; EventFilter select clauses and ContentFilter operands are
  built immutably.

UserName identity (lmxopcua#880): SDK 2's default handler sends a
password over 64 bytes - every 65-character OtOpcUa API key - as an
RsaEncryptedSecret that SDK 1.5 servers reject with BadIdentityTokenInvalid
and SDK 2 servers accept only within a 5-minute clock window (#873). The
DCL now always uses LegacyRsaUserNameIdentityTokenHandler (ported from
OtOpcUa be28aa44), i.e. exactly what it sent on SDK 1.5, so it logs in to
both server generations during a mixed rollout.

Tests: the in-process secured test server is ported to SDK 2 and can
admit an API key; new tests cover the handler (mutation-checked: 5 of 7
fail with the SDK default handler), the value boundary, and a 65-char key
end to end over None/Sign/SignAndEncrypt with a wrong key reaching the
key check (BadIdentityTokenRejected).

Claude-Session: https://claude.ai/code/session_01GT67ACmpMR7b9LGRPLijMi

tests/ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests/OpcUaStatusCodeMappingTests.cs

@@ -7,18 +7,25 @@ namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests;
 /// <summary>ScadaBridge#117: quality follows the StatusCode severity bits, not "== 0".</summary>
 public class OpcUaStatusCodeMappingTests
 {
+    // SDK 2 (ScadaBridge#125): StatusCodes members are StatusCode structs, not constants, so the
+    // cases are a TheoryData rather than InlineData.
+    public static TheoryData<uint, QualityCode> Cases => new()
+    {
+        { StatusCodes.Good.Code, QualityCode.Good },
+        { StatusCodes.GoodLocalOverride.Code, QualityCode.Good },
+        { StatusCodes.GoodClamped.Code, QualityCode.Good },
+        { StatusCodes.Good.Code | 0x0480u, QualityCode.Good }, // info bits set
+        { StatusCodes.Uncertain.Code, QualityCode.Uncertain },
+        { StatusCodes.UncertainLastUsableValue.Code, QualityCode.Uncertain },
+        { StatusCodes.UncertainSensorNotAccurate.Code, QualityCode.Uncertain },
+        { StatusCodes.Bad.Code, QualityCode.Bad },
+        { StatusCodes.BadNodeIdUnknown.Code, QualityCode.Bad },
+        { StatusCodes.BadResourceUnavailable.Code, QualityCode.Bad },
+        { 0xC0000000u, QualityCode.Bad },
+    };
+
     [Theory]
-    [InlineData(StatusCodes.Good, QualityCode.Good)]
-    [InlineData(StatusCodes.GoodLocalOverride, QualityCode.Good)]
-    [InlineData(StatusCodes.GoodClamped, QualityCode.Good)]
-    [InlineData(StatusCodes.Good | 0x0480u, QualityCode.Good)] // info bits set
-    [InlineData(StatusCodes.Uncertain, QualityCode.Uncertain)]
-    [InlineData(StatusCodes.UncertainLastUsableValue, QualityCode.Uncertain)]
-    [InlineData(StatusCodes.UncertainSensorNotAccurate, QualityCode.Uncertain)]
-    [InlineData(StatusCodes.Bad, QualityCode.Bad)]
-    [InlineData(StatusCodes.BadNodeIdUnknown, QualityCode.Bad)]
-    [InlineData(StatusCodes.BadResourceUnavailable, QualityCode.Bad)]
-    [InlineData(0xC0000000u, QualityCode.Bad)]
+    [MemberData(nameof(Cases))]
     public void MapStatusCode_UsesSeverityBits(uint code, QualityCode expected) =>
         Assert.Equal(expected, OpcUaDataConnection.MapStatusCode(code));
 }