Scope daemon telemetry isolation assertion to hover metrics

[Copilot]

Daemon_EachServerHasAnIsolatedTelemetrySession intermittently fails on main because it expects the second server to have recorded no metrics. That server can independently record initialization metrics while the first handles a hover request.

• Assertion: Filter the second server’s recorded metrics by LSP method, so the isolation check measures hover telemetry rather than all server activity.
• Regression coverage: Have the second server handle its own hover request and assert that its sink records it.

Original prompt

Test Failure: Daemon_EachServerHasAnIsolatedTelemetrySession

Failure Details

• Test: Daemon_EachServerHasAnIsolatedTelemetrySession
• Repository: dotnet/roslyn
• Build: #1618416
• Run: Test Linux Debug
• Failed in: 5 build(s)

Error Message

Assert.Equal() Failure: Values differ
Expected: 0
Actual:   1

Stack Trace

   at Microsoft.CodeAnalysis.LanguageServer.UnitTests.LanguageServerDaemonTests.Daemon_EachServerHasAnIsolatedTelemetrySession() in /_/src/LanguageServer/Microsoft.CodeAnalysis.LanguageServer.UnitTests/Daemon/LanguageServerDaemonTests.cs:line 150
   at Microsoft.CodeAnalysis.LanguageServer.UnitTests.LanguageServerDaemonTests.Daemon_EachServerHasAnIsolatedTelemetrySession() in /_/src/LanguageServer/Microsoft.CodeAnalysis.LanguageServer.UnitTests/Daemon/LanguageServerDaemonTests.cs:line 165
   at Microsoft.CodeAnalysis.LanguageServer.UnitTests.LanguageServerDaemonTests.Daemon_EachServerHasAnIsolatedTelemetrySession() in /_/src/LanguageServer/Microsoft.CodeAnalysis.LanguageServer.UnitTests/Daemon/LanguageServerDaemonTests.cs:line 165
--- End of stack trace from previous location ---

Instructions

This is failing regularly in main, please suggest a fix here

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