fix(formatter): never format biome.json with trailing commas #3007
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Summary
This ensures that trailing commas is always disabled when formatting
biome.json
orbiome.jsonc
. Failing to do so could result in biome formatting it's own configuration such that it's no longer valid json, and would not get parsed. The full context is in #2990.fixes #2990
Test Plan
I added a cli test for this scenario.
cargo test -p biome_cli always_disable_trailing_commas_biome_json