We're showing `.cts` and `.mts` files as supported, but Webpack CLI will
not load them.
The language support is outlined here:
https://webpack.js.org/configuration/configuration-languages/#typescript
This PR removes those extensions to match what our plugin actually
infers from.
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## Current Behavior
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## Expected Behavior
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## Related Issue(s)
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merged. -->
Fixes#27438
aa59a69af2