chore(tests): retire obsolete TCP integration fixtures

[yordis]

• Removes integration fixtures that only exercised the retired transport.

[cursor]

PR Summary

Low Risk
Test-only deletions with no runtime code changes; main risk is reduced regression coverage for retired TCP paths and for stream metadata copying.

Overview
Deletes a batch of EventStore.Core.Tests fixtures tied to the retired TCP client transport and related cluster/TCP scenarios, aligning the test suite with transports that are still supported.

Removed coverage includes TCP dispatcher behavior for v2 clients (deleted streams, subscriptions, scavenge responses), TcpConnectionManager (trusted writes, pending-send and queue limits), plain and SSL TcpConnection lifecycle tests, invalid TCP payload integration checks, and intermediate certificate handshake tests. Also drops the long-running when_node_becomes_leader_with_unindexed_data cluster integration fixture.

The diff also removes copying_metadata, which exercised StreamMetadata.Copy() via the Client API and is not TCP-specific, so that behavior is no longer covered in this project unless tests live elsewhere.

^{Reviewed by Cursor Bugbot for commit 2c805a1. Bugbot is set up for automated code reviews on this repo. Configure here.}

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📥 Commits

Reviewing files that changed from the base of the PR and between a9a13e7 and 2c805a1.

📒 Files selected for processing (8)

• src/EventStore.Core.Tests/Integration/when_node_becomes_leader_with_unindexed_data.cs
• src/EventStore.Core.Tests/Services/Transport/Tcp/TcpClientDispatcherTests.cs
• src/EventStore.Core.Tests/Services/Transport/Tcp/TcpConnectionManagerTests.cs
• src/EventStore.Core.Tests/Services/Transport/Tcp/TcpConnectionSslTests.cs
• src/EventStore.Core.Tests/Services/Transport/Tcp/TcpConnectionTests.cs
• src/EventStore.Core.Tests/Services/Transport/Tcp/when_invalid_data_is_sent_over_tcp.cs
• src/EventStore.Core.Tests/Services/Transport/Tcp/with_intermediate_certificates.cs
• src/EventStore.Core.Tests/copying_metadata.cs

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