CSHARP-5871: Clarify phase description for "Network timeouts test" spec test

[sanych-sun]

No description provided.

[Copilot]

Pull request overview

Updates the SDAM “Network timeouts test” handshake spec to reflect that pre-handshake network timeouts are ignored (rather than marking the server Unknown), and adjusts the C# SDAM spec test runner to simulate the required error label.

Changes:

• Add the SystemOverloadedError label to simulated timeout MongoConnectionExceptions in the SDAM spec test runner.
• Update the handshake error handling spec test (YAML + JSON) to “Ignore network timeout … (beforeHandshakeCompletes)” and to expect an unchanged topology outcome.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/MongoDB.Driver.Tests/Specifications/server-discovery-and-monitoring/ServerDiscoveryAndMonitoringTestRunner.cs	Labels simulated timeout connection exceptions with SystemOverloadedError so the driver’s pre-handshake SDAM handling ignores them.
specifications/server-discovery-and-monitoring/tests/errors/error_handling_handshake.yml	Adjusts the “beforeHandshakeCompletes” timeout phase to be ignored and reuses the shared *outcome.
specifications/server-discovery-and-monitoring/tests/errors/error_handling_handshake.json	Mirrors the YAML change by updating the phase description and expected outcome to remain RSPrimary / ReplicaSetWithPrimary.

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