[js/webgpu] reuse buffer for GpuDataManager (#16746)
### Description
<!-- Describe your changes. -->
Allocating new GPUBuffer in every session.run is not efficient. We
should make it only happen in the first run. In the following runs, we
should try to reuse those buffers.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
- This PR is for performance.
See mobilenetv2 becomes 9.58 ms from 12.9 ms.
