fix: optimize block creation by using bulk operations in modulestore

[bra-i-am]

Description

This pull request updates the block creation logic in view_handlers.py to ensure that all operations related to creating and syncing a block are performed within a bulk operation context, improving data consistency.

Improvements to block creation and synchronization:

• Ensured that the modulestore is instantiated and its bulk_operations context is used when creating a new block, so all related changes are grouped and atomic.
• Moved the store instantiation to the top of the function and reused it in both the block creation and library content synchronization steps, reducing redundant code and potential errors.

Testing instructions

Please follow the instructions to test openedx/frontend-app-authoring#2824; the difference you would find with and without this change is that this allows adding problems again and again without displaying requests or error messages

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