refactor: slash-and-burn Word Cloud BuiltIn XBlock

[irfanuddinahmad]

Summary

Removes the built-in Word Cloud XBlock and all associated assets. The extracted xblocks_contrib.word_cloud.WordCloudBlock has been the active implementation since USE_EXTRACTED_WORD_CLOUD_BLOCK = True.

Step 2 of 8 in the Slash-n-Burn Built-In XBlocks epic.

Changes

• Remove USE_EXTRACTED_WORD_CLOUD_BLOCK toggle from openedx/envs/common.py
• Remove word_cloud entrypoint from pyproject.toml
• Delete xmodule/word_cloud_block.py
• Delete xmodule/assets/word_cloud/ (JS, D3 vendor libs, and custom webpack.config.js)
• Delete lms/templates/word_cloud.html
• Delete xmodule/static/css-builtin-blocks/WordCloudBlockDisplay.css
• Remove WordCloudBlockDisplay / WordCloudBlockEditor webpack entries from webpack.builtinblocks.config.js and webpack.common.config.js
• Delete xmodule/tests/test_word_cloud.py and lms/djangoapps/courseware/tests/test_word_cloud.py

Test plan

• Run xmodule unit tests: pytest xmodule/tests/
• Verify Word Cloud block still renders in a course (smoke test using xblocks-contrib version)
• Confirm webpack build succeeds: npm run build

Closes openedx/public-engineering#534

Closes openedx/public-engineering#534

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