Rollup merge of #93847 - solid-rs:fix-kmc-solid-fs-ts, r=yaahc

kmc-solid: Use the filesystem thread-safety wrapper

Fixes the thread unsafety of the `std::fs` implementation used by the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets.

Neither the SOLID filesystem API nor built-in filesystem drivers guarantee thread safety by default. Although this may suffice in general embedded-system use cases, and in fact the API can be used from multiple threads without any problems in many cases, this has been a source of unsoundness in `std::sys::solid::fs`.

This commit updates the implementation to leverage the filesystem thread-safety wrapper (which uses a pluggable synchronization mechanism) to enforce thread safety. This is done by prefixing all paths passed to the filesystem API with `\TS`. (Note that relative paths aren't supported in this platform.)

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