…-empty

Closes #43217

Adds a new smoke CI workflow (.github/workflows/smoke-token-telemetry.md)
that runs a minimal copilot LLM call daily and asserts:
- At least one token_usage.jsonl file in the agent artifact is non-empty
- agent_usage.json reports non-zero input_tokens

This catches token-telemetry emitter regressions in hours rather than weeks,
protecting api-consumption, detection, and cost audits. The check_token_telemetry
custom job runs after the agent job and before the conclusion job; the overall
workflow fails fast if the AWF firewall proxy token emitter is broken.

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>