bug: error happend in building request is confusing

[Xuanwo]

Related to risingwavelabs/risingwave#7844 (comment)

2023-02-17T06:04:57.351493Z  WARN risingwave_storage::hummock::compactor::shared_buffer_compact: Shared Buffer Compaction failed with error: ObjectStore failed with IO error Unexpected (permanent) at write, context: { service: webhdfs, path: hummock_001/2.data } => building request, source: invalid format.
  backtrace of `HummockError`:
   0: <risingwave_storage::hummock::error::HummockError as core::convert::From<risingwave_storage::hummock::error::HummockErrorInner>>::from
             at ./src/storage/src/hummock/error.rs:68:10
   1: <T as core::convert::Into<U>>::into
             at /rustc/3984bc5833db8bfb0acc522c9775383e4171f3de/library/core/src/convert/mod.rs:726:9
   2: risingwave_storage::hummock::error::HummockError::object_io_error
             at ./src/storage/src/hummock/error.rs:78:9
   3: core::ops::function::FnOnce::call_once
             at /rustc/3984bc5833db8bfb0acc522c9775383e4171f3de/library/core/src/ops/function.rs:250:5
   4: core::result::Result<T,E>::map_err
             at /rustc/3984bc5833db8bfb0acc522c9775383e4171f3de/library/core/src/result.rs:860:27
   5: risingwave_storage::hummock::sstable_store::SstableStore::put_sst_data::{{closure}}
             at ./src/storage/src/hummock/sstable_store.rs:205:9
   6: <risingwave_storage::hummock::sstable_store::BatchUploadWriter as risingwave_storage::hummock::sstable::writer::SstableWriter>::finish::{{closure}}::{{closure}}
             at ./src/storage/src/hummock/sstable_store.rs:573:17

Maybe change building request into building http request and add more context.