feat(csharp): wire telemetry for SEA/REST protocol connections

[eric-wang-1990]

Summary

• Created SeaConnectionTelemetry implementing IConnectionTelemetry for the REST protocol, with a Create() factory that mirrors ConnectionTelemetry.Create() but uses session ID string (no Thrift handle) and emits DriverMode.Sea
• Wired telemetry initialization in StatementExecutionConnection.OpenAsync() after session creation; telemetry is flushed/released on Dispose()
• Statement-level telemetry (execute latency, result format, chunk metrics, error info) is emitted per-statement in StatementExecutionStatement for both ExecuteQueryAsync and ExecuteUpdateAsync, matching the DatabricksStatement (Thrift) implementation
• Removed 7 TODO: PECO-3010 comments from telemetry E2E test files now that SEA telemetry is wired

Jira

Fixes PECO-3010

Test plan

• Build succeeds without errors
• Telemetry events are emitted for SEA connections (verified by TelemetryBaselineTests, AuthTypeTests, ClientTelemetryE2ETests, etc.)
• Thrift-only telemetry tests (ChunkDetailsTelemetryTests, ConnectionParametersTests, RetryCountTests) continue to skip for rest protocol

🤖 Generated with Claude Code

[eric-wang-1990]

Superseded by the telemetry rework that landed — esp. #460 (protocol-agnostic ConnectionTelemetry) plus #437/#438/#517. Reopen if a SEA/REST telemetry gap remains.