refactor: slash-and-burn Poll BuiltIn XBlock

[irfanuddinahmad]

Summary

Removes the built-in Poll XBlock and all associated assets. The extracted xblocks_contrib.poll.PollBlock has been the default since USE_EXTRACTED_POLL_QUESTION_BLOCK was set to True, so the built-in implementation is now dead code.

Step 1 of 8 in the Slash-n-Burn Built-In XBlocks epic.

Changes

• Remove USE_EXTRACTED_POLL_QUESTION_BLOCK toggle from openedx/envs/common.py
• Remove poll_question entrypoint from pyproject.toml
• Delete xmodule/poll_block.py (built-in class + shim)
• Delete xmodule/js/src/poll/ (JS assets)
• Delete lms/templates/poll.html
• Delete xmodule/static/css-builtin-blocks/PollBlockDisplay.css
• Remove PollBlockDisplay / PollBlockEditor webpack entries from webpack.builtinblocks.config.js and webpack.common.config.js
• Delete xmodule/tests/test_poll.py (covered by xblocks-contrib tests)

Test plan

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

Closes openedx/public-engineering#533

Closes openedx/public-engineering#533

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