FlagScope can't automatically disable wasm-dynamic-tiering.

Bug: v8:7748

Change-Id: Ieb59e20b4cb4436277aa88b615bca07657a1212c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3578109
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79920}