tensorzero Added an Add as Demonstration button to the inference TryWithVariant modal

UI Components: Added DemonstrationFeedbackButton in DemonstrationFeedbackButton.tsx for submitting demonstration feedback. Updated VariantResponseModal in VariantResponseModal.tsx to include DemonstrationFeedbackButton .
Routes: Modified route.tsx to handle demonstration feedback submission and navigation. Added prepareDemonstrationFromVariantOutput() to process variant output for feedback.
Testing: Updated .github/workflows/ui-tests-e2e.yml to run UI E2E tests requiring credentials. Added e2e test in observability.inferences.$inference_id.spec.ts for adding demonstration feedback via the "Try with variant" flow.

should use the same pattern as the existing HumanFeedbackForm so wasn't too complicated

[!IMPORTANT] Added a button to submit demonstration feedback in the inference modal and updated UI tests to handle credentials.

UI Components:

Added DemonstrationFeedbackButton in DemonstrationFeedbackButton.tsx for submitting demonstration feedback.

Updated VariantResponseModal in VariantResponseModal.tsx to include DemonstrationFeedbackButton.

Routes:

Modified route.tsx to handle demonstration feedback submission and navigation.

Added prepareDemonstrationFromVariantOutput() to process variant output for feedback.

Testing:

Updated .github/workflows/ui-tests-e2e.yml to run UI E2E tests requiring credentials.

Added e2e test in observability.inferences.$inference_id.spec.ts for adding demonstration feedback via the "Try with variant" flow.

^{This description was created by}^{for 6bf8da8cff16da69326055c005affe8e36269e8a. You can customize this summary. It will automatically update as commits are pushed.}