ff921cd608
On Fuchsia, we can now get executable VMOs from trusted backing filesystems. This allows us to remove the use of replace_as_executable in favor of opening files with `fdio_open_fd_at` with the `OPEN_RIGHT_EXECUTABLE` flag and getting VMOs by calling `fdio_get_vmo_exec`. By moving the responsibility for executability into the filesystem, we should be able to remove deprecated-ambient-replace-as-executable from component manifests for non-JIT runners (the JIT runners still call replace_as_executable in Dart's allocator). Test: verified locally that this works on Astro on a _user build with the runtime allowlist tightened.
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