Byte-array elements leak in `FromSchemaByteArray()`

### Describe the bug, including details regarding any error messages, version, and platform.

I found a possible JNI array leak in `FromSchemaByteArray()` when the serialized schema cannot be parsed.

File: `dataset/src/main/cpp/jni_util.cc`

Function: `FromSchemaByteArray`

Relevant code:

```cpp
jbyte* schemaBytes_data =
env->GetByteArrayElements(schemaBytes, nullptr);
auto serialized_schema = std::make_shared(
reinterpret_cast(schemaBytes_data),
schemaBytes_len);
arrow::io::BufferReader buf_reader(serialized_schema);

ARROW_ASSIGN_OR_RAISE(
std::shared_ptr schema,
arrow::ipc::ReadSchema(&buf_reader, &in_memo))

env->ReleaseByteArrayElements(
schemaBytes, schemaBytes_data, JNI_ABORT);
return schema;
```

`GetByteArrayElements()` returns a pointer that must be paired with
`ReleaseByteArrayElements()`.

`ARROW_ASSIGN_OR_RAISE` returns immediately when `ReadSchema()` returns an
error. On that path, the release below the macro is skipped, so the acquired
array elements remain unreleased:

```text
GetByteArrayElements succeeds
-> ReadSchema returns an error
-> ARROW_ASSIGN_OR_RAISE returns
-> ReleaseByteArrayElements is skipped
```

The function is used by the public native `createDataset()` method:

```cpp
schema = JniGetOrThrow(
FromSchemaByteArray(env, schema_bytes));
```

Malformed, corrupted, or incompatible serialized schema bytes can therefore
reach this path. Repeated failed calls can retain copied array buffers or keep
Java arrays pinned, depending on the JVM implementation.

Suggested fix: release the elements before propagating the parse result, for
example:

```cpp
auto schema_result =
arrow::ipc::ReadSchema(&buf_reader, &in_memo);

env->ReleaseByteArrayElements(
schemaBytes, schemaBytes_data, JNI_ABORT);

return schema_result;
```

An RAII guard for `schemaBytes_data` would also ensure release if additional
early returns are introduced later.

Start in dataset/src/main/cpp/jni_util.cc at FromSchemaByteArray() and inspect the GetByteArrayElements, ReadSchema, and ReleaseByteArrayElements flow. Verify the release also occurs when parsing fails, then exercise the malformed or incompatible schema path through createDataset(); done means the acquired JNI array elements are released on both success and error paths.

Written by the indexing model from the issue text.