fix: enforce MAX_BLOCKS_PER_CONTENT_LIBRARY when creating containers

[Chessing234]

Summary

create_container() did not check MAX_BLOCKS_PER_CONTENT_LIBRARY before adding a draft container, so users at the component limit could still create empty units/sections. This adds the same draft-count guard used in validate_can_add_block_to_library().

Fixes #37697

Test plan

• Set MAX_BLOCKS_PER_CONTENT_LIBRARY to a low value (e.g. 5)
• Create components until the limit is hit; confirm new components are rejected
• Attempt to create a container; confirm BlockLimitReachedError is raised

Made with Cursor

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[mphilbrick211]

Hi @Chessing234! Welcome, and thank you for this contribution! In order for your CLA check to turn green, you'll need to submit a CLA form. If you are contributing as an individual, please fill out the individual CLA form here.

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Please let me know if you have any questions. Thanks!