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Do not trace Rust values when thread is shutting down. This addresses a paint point when using debug-mozjs builds. jonco says that it is considered a leak when objects stored in side tables in a SpiderMonkey embedding are traced right before shutting down. This PR adds a per-thread flag that controls whether to run the Rust-side trace hooks, which is automatically toggled before the final GC occurs when destroying a JS runtime. --- - [x] `./mach build -d` does not report any errors - [x] `./mach test-tidy` does not report any errors - [x] These changes fix #18948 and fix #18947. - [x] These changes do not require tests because we don't use debug-mozjs on CI <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18952) <!-- Reviewable:end -->