Adjust handling of incomplete tags

[natemoo-re]

Changes

• Still a WIP!
• Fixes 🐛 BUG: [TSX] Unclosed tag result in unnecessary escaping #862
• The goal is to introduce a new heuristic for tokenization that allows incomplete tags to be preserved in the TSX output

Testing

• New tests added
• New tests passing
• Comprehensive regression tests

Docs

This will be a bug fix

[changeset-bot]

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Latest commit: 8ee0724

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