chore(build): OpcUaClient driver/browser on ITelemetryContext ctors, TreatWarningsAsErrors on remaining src projects (#621 #606)

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient/SdkTelemetry.cs

@@ -0,0 +1,16 @@
+using Opc.Ua;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient;
+
+/// <summary>
+///     The one <see cref="ITelemetryContext" /> the driver hands the SDK's non-obsolete (telemetry-taking)
+///     overloads. An empty builder keeps SDK internals off any logging provider (mirrors Client.Shared's
+///     <c>ClientTelemetry</c>).
+/// </summary>
+internal static class SdkTelemetry
+{
+    private static readonly Lazy<ITelemetryContext> Instance = new(() => DefaultTelemetry.Create(_ => { }));
+
+    /// <summary>Gets the shared telemetry context.</summary>
+    public static ITelemetryContext Context => Instance.Value;
+}