fix: ensure TagCountFactory is bundled in production

[Agrendalath]

This removes the static:webpack directive and uses add_webpack_js_to_fragment to properly include TagCountFactory in production. The previous solution (#34059) did not correctly bundle this factory, causing the ReferenceError: TagCountFactory is not defined JS error in the Studio preview.

Testing instructions

1. Check out this branch.
2. Run tutor dev exec cms npm run webpack.
3. View a unit in Studio and ensure that there is no ReferenceError: TagCountFactory is not defined error in the console logs.

Private-ref: BB-9480

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