Rename emscripten_main_browser_thread_id to emscripten_main_runtime_thread_id. NFC #18872
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The better reflects that is actually being returned here. In fact, there may be no main browser thread at all, and we have never tracked the thread ID of the main browser thread, only the main runtime thread.
Use a macro to continue to support the old name, but mark is as deprecated so folks will get a warning.