[Socket] Fix expected exception type

[ManickaP]

Fixes #118314

[Copilot]

Pull Request Overview

This PR fixes a test that was expecting the wrong exception type when attempting to disconnect a socket that isn't connected. The change corrects the expected exception from InvalidOperationException to SocketException and removes the ActiveIssue attribute that was tracking this problem.

Key Changes

• Updates test expectation to match actual socket behavior
• Removes ActiveIssue tracking since the issue is now resolved

Comments suppressed due to low confidence (1)

src/libraries/System.Net.Sockets/tests/FunctionalTests/DisconnectTest.cs:79

• The test method name should be updated to reflect the correct exception type. Consider renaming to Disconnect_NotConnected_ThrowsSocketException to match the actual behavior being tested.

        public async Task Disconnect_NotConnected_ThrowsSocketException(bool reuseSocket)

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[wfurt]

LGTM