sandbox: test xblocks-contrib Problem Block JS ES6+ modernization (PR #262)

[irfanuddinahmad]

Summary

This is a sandbox PR for CI testing only — not intended to be merged.

Points xblocks-contrib at the ES6+ modernization branch under review at openedx/xblocks-core#262 to verify end-to-end compatibility with the platform.

Change: Replaces xblocks-contrib==0.17.0 with a direct git reference to the PR branch across all four compiled requirements files (base.txt, testing.txt, development.txt, doc.txt).

xblocks-contrib @ git+https://github.com/irfanuddinahmad/xblocks-core.git@irfanuddinahmad/modernize-problem-block-js-438

What's being tested

The PR under review converts the three Problem Block JS files (display.js, imageinput.js, schematic.js) from legacy CoffeeScript-era IIFE patterns to ES6+ syntax (classes, const/let, template literals, proper imports/exports) and removes the imports-loader workarounds from webpack config.

Do not merge

This branch will be deleted once the xblocks-core PR is merged and a new xblocks-contrib release is published.

🤖 Generated with Claude Code

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