…r_utils so importing vertexai.preview.evaluation doesn't require it

PiperOrigin-RevId: 1003442640

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ddecc50 by release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>:

chore(main): release 2.6.0

COPYBARA_INTEGRATE_REVIEW=#7218 from googleapis:release-please--branches--main ddecc50
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…ent Engine deployment

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…t_disabled and spot without a machine type

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…her_model_deploy_options now read the catalog from us-central1 for clients in any location

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…n fallback session creation in AdkApp.

When `AdkApp.streaming_agent_run_with_events` receives a caller-supplied `request.session_id` and `session_service.get_session` does not find an existing session, `AdkApp` falls back to `self._init_session(...)` and creates a new session with a server-generated `session.id`. Pass `state={_UPSTREAM_SESSION_ID_KEY: request.session_id}` (`"agent_engine:upstream_session_id"`) to `session_service.create_session(...)` inside `_init_session` so custom ADK agents and plugins (including `on_user_message_callback` on turn 1) can correlate logs and telemetry with the caller's originating session ID via `session.state["agent_engine:upstream_session_id"]`.

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…ort}` in `Sandboxes.send_command` and `ws://{psc_endpoint}:{port}` in `Sandboxes.generate_browser_ws_headers`, instead of `https://{psc_endpoint}` on 443. The sandbox router pod serves plain HTTP on the caller-supplied port (default 8080) and does not terminate TLS on 443, so the prior URLs hung on `ConnectTimeout`. Non-VPC-SC branches are unaffected.

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… are available

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Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>