feat: remove built-in LTI XBlock implementation (slash-n-burn #37819)

[irfanuddinahmad]

Summary

Removes the built-in LTI XBlock from xmodule/ as part of the Slash-n-Burn Built-In XBlocks epic (#37819). The extracted version in xblocks-contrib has been the active implementation since USE_EXTRACTED_LTI_BLOCK was set to True (commit bcddf9cd53).

Deleted:

• xmodule/lti_block.py — built-in _BuiltInLTIBlock and shim
• xmodule/lti_2_util.py — LTI 2.0 utilities (now in xblocks-contrib)
• xmodule/tests/test_lti_unit.py, test_lti20_unit.py — built-in tests
• xmodule/js/src/lti/lti.js, xmodule/js/fixtures/lti.html — JS/fixture
• xmodule/static/css-builtin-blocks/LTIBlockDisplay.css
• lms/templates/lti.html, lms/templates/lti_form.html — built-in templates

Modified:

• openedx/envs/common.py — removed USE_EXTRACTED_LTI_BLOCK toggle
• pyproject.toml — removed conflicting lti entrypoint
• webpack.builtinblocks.config.js — removed LTIBlockDisplay/LTIBlockEditor entries
• webpack.common.config.js — removed imports-loader rule for lti/lti.js
• lms/djangoapps/courseware/tests/test_block_render.py — import from xblocks_contrib.lti
• lms/djangoapps/courseware/tests/test_lti_integration.py — removed toggle-conditional branches and duplicate test classes; removed importlib.reload(lti_block)

Note: lms/djangoapps/lti_provider/ (LTI protocol callback handler) is not in scope for this removal.

Test plan

• Run pytest lms/djangoapps/courseware/tests/test_lti_integration.py — should pass with single TestLTI and TestLTIBlockListing classes
• Run pytest lms/djangoapps/courseware/tests/test_block_render.py — no LTI import errors
• Verify LTI XBlocks in a live course still render (served by xblocks-contrib)
• Check xblock.v1 entrypoints: python -c "from xblocks_contrib.lti import LTIBlock; print(LTIBlock)" — should succeed

🤖 Generated with Claude Code

Closes openedx/public-engineering#537

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