Use GC stack in nested data removal

We should be doing this anyway to prevent stack overflow, but on
master this is important for an additional reason: The temporary
GC buffer provid

Use GC stack in nested data removal

We should be doing this anyway to prevent stack overflow, but on
master this is important for an additional reason: The temporary
GC buffer provided for get_gc handlers may get reused if the scan
is performed recursively instead of indirected via the GC stack.

This fixes oss-fuzz #23350.

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