Live-check: return report in HTTP response when /stop is called

[lmolkova]

Trying out weaver-live check to validate gen-ai instrumentations in python in https://github.com/open-telemetry/opentelemetry-python-contrib/compare/main...lmolkova:opentelemetry-python-contrib:add-weaver-live-check-for-gen-ai?expand=1 (mostly https://github.com/lmolkova/opentelemetry-python-contrib/blob/5a53eb3833a3560dab4c5b41ebe3d9e7f849e101/util/opentelemetry-util-genai/tests/weaver_container.py)

It would be much easier (no volume mapping, permissions, IO handling, reading logs) to return response or errors when /stop is invoked in HTTP response.

I.e. /stop would return

• full json report (when validation succeed)
• list of errors (in json) if validation has failed (e.g. because of jq or rego errors)

Also got this feedback at KubeCon from @pellared