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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[farhaanbukhsh]

@Agrendalath can you please add testing instruction to reproduce this issue?

[Agrendalath]

@farhaanbukhsh, it should be possible to reproduce this by skipping the first step from the "Testing instructions" section of this PR's description.

[farhaanbukhsh]

@Agrendalath I am not able to find out the error in the console.

[Agrendalath]

@farhaanbukhsh, I see. I will check this again next week.

[Agrendalath]

@farhaanbukhsh, I cannot reproduce this error anymore. Let's close this PR.