Fix screenshot workflow: derive versions at runtime, fix collector URL, assert no error pages#417

jaydeluca merged 4 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-ecosystem-explorer:mainfrom

MeloveGupta:fix/screenshot-stale-versions-and-error-detectionMeloveGupta/opentelemetry-ecosystem-explorer:fix/screenshot-stale-versions-and-error-detectionCopy head branch name to clipboard