chat: redact remote session type telemetry (#316731)

* chat: redact remote session type telemetry (Written by Copilot)

Report remote chat session schemes as remote-agent-host in interactiveSessionProviderInvoked telemetry instead of sending the full remote-* scheme. (Written by Copilot)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* chat: restore session type telemetry comment (Written by Copilot)

Restore the existing GDPR annotation comment while keeping the remote session type telemetry redaction behavior. (Written by Copilot)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>