fix(rust: builder): add lifetime bounds to finish methods #8750
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This change addresses a reported issue where a FlatBufferBuilder could be finished with a WIPOffset created by a different builder.
Calling builder1.finish(offset_from_builder2) would compile but result in a runtime panic or data corruption, as the offset is meaningless in builder1's buffer.
The fix enforces the builder's lifetime ('fbb) on the generic type T of the WIPOffset in all finish methods (finish, finish_minimal, finish_size_prefixed, and finish_with_opts).
#8698