fix: disable V8 external memory check to prevent panic on large TypedArrays (#33896)
- Set `--external-memory-max-reasonable-size=0` in default V8 flags to
disable the external memory reasonableness check
This prevents a fatal V8 `CHECK` failure when allocating large
TypedArrays (e.g. `new Float64Array(10e9)`), which triggers the
`change_in_bytes < kMaxReasonableBytes` assertion in V8's external
memory tracking.
Closes #33747