Add new optional tidy check to check if ftl error messages are unused#147191

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GuillaumeGomez:unused-err-msg

Commits on Sep 30, 2025

Add new optional tidy check to check if `ftl` error messages are unused
GuillaumeGomez
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Remove unused error messages
GuillaumeGomez
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Update compiler source code to more easily check if error messages are used
GuillaumeGomez
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