The checksum file is integrated and the installer is not working

[Yaminyam]

Motivation  

[Why is this Task important? Explain the context and reasons for this task.]  

• https://github.com/lablup/backend.ai/blob/6556f26630f1068de37cc568e36bd331d00b3630/src/ai/backend/install/context.py#L996
• Previously, checksum files were downloaded for each package, but since version 25, the checksum files have been consolidated into a single file, which is not working.
  ![CleanShot 2025-02-04 at [email protected]](CleanShot 2025-02-04 at [email protected]){width=1175 height=347}

Objective  

[Clearly state the purpose or goal of this task.]  

• Change the installer to download and use the combined checksum.

Details  

[Outline the specific steps or changes needed to complete this task.]  

Impact  

[Describe how this task may indirectly influence other services, if at all.]