thorstenalpers / OpenTelemetryExtension.Configuration / 27303504378

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test: add OpenObserve integration tests for logs, metrics, traces and SQL Server

New OpenTelemetryExtension.Configuration.IntegrationTests project emits telemetry
through AddTelemetry() to a live OpenObserve instance (the Helm chart) and queries
its _search API to assert the data arrived:
- logs and traces in the "default" stream filtered by service_name
- a custom counter metric in its own metrics stream
- a SQL Server command span (Microsoft.Data.SqlClient + AddSqlClientInstrumentation),
  asserting db_system_name = "microsoft.sql_server"

Tests are marked [Trait("Category","Integration")] via a custom IntegrationFact /
SqlIntegrationFact that auto-skips when OpenObserve / SQL Server is unreachable, so
a normal dotnet test run never fails without the stack. Endpoints/credentials
default to the Helm chart values and are overridable via OTEL_IT_* env vars.

Docs & CI:
- CONTRIBUTING.md / AGENTS.md: document the integration tests and the rule to run
  unit tests (always) plus integration tests (when the stack is up) on feature work.
- ci.yml: filter Category!=Integration on the unit test run.
- deploy-nuget.yml: build only the library + unit tests (the solution now contains a
  net10.0-windows WPF sample that cannot build on the Linux deploy runner).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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