Revert "feat: incrementally load large assessment xblocks"

[santhosh-apphelix-2u]

Reverts #445

[Copilot]

Pull request overview

This PR reverts the previously introduced “incremental assessment load” feature, restoring the prior behavior where VerticalBlocks render all children server-side and removing the supporting API endpoint, settings, templates, toggles, and tests.

Changes:

• Remove incremental child rendering in VerticalBlock and its template support for lazy placeholders.
• Remove the /api/courseware/xblock_children/ endpoint and associated tests.
• Remove related configuration (settings + waffle toggle) and helper logic in courseware rendering.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
xmodule/vertical_block.py	Reverts eager/lazy split; renders all children inline again and removes lazy child metadata from template context.
openedx/core/djangoapps/courseware_api/views.py	Removes XBlockChildren API view and related imports.
openedx/core/djangoapps/courseware_api/urls.py	Removes the xblock_children route registration.
openedx/core/djangoapps/courseware_api/tests/test_views.py	Removes tests for the deleted xblock_children endpoint.
lms/templates/vert_module.html	Removes placeholder markup and bootstrap include used for incremental loading.
lms/templates/vert_module_lazy_bootstrap.html	Deletes the JS bootstrap template for incremental loading.
lms/envs/common.py	Removes incremental-load-related settings (INCREMENTAL_LOAD_*, XBLOCK_CHILDREN_BATCH_MAX).
lms/djangoapps/courseware/views/views.py	Removes logic that opted large assessments into incremental loading via render context.
lms/djangoapps/courseware/toggles.py	Removes the courseware.incremental_assessment_load waffle flag and helper.
lms/djangoapps/courseware/tests/test_incremental_render.py	Deletes test coverage specific to the reverted feature.
lms/djangoapps/courseware/block_render.py	Removes incremental-load helpers and the batch rendering implementation; restores original get_block_by_usage_id behavior/signature.

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