…using vfolder_mounts (#3038)

resolves #3051 (FR-249)
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>lablup/backend.ai#3461 PR must be merged first.

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This PR makes folder explorer available in the Session Detail Panel.

In versions prior to Backend.AI Core 24.12.0, the vfolder_nodes field is not provided. Therefore, you must use the `mounts` field of the `compute_session_node` query.

Mounts field does not provide vfolder name. So we need to use `vfolder_mounts` field in legacy `compute_session` query.  vfolder_mounts' provide the name of the vfolder in the same order as the `mounts' field in `compute_session_node'.

**Feature:**
- allow to open folder explorer in session detail panel

**How to test:**
- checkout Core branch to [lablup/backend.ai#3461](lablup/backend.ai#3461)
- open session detail panel. you can open session detail panel via using query string (?sessionDetail=<sessionID>)
- click the folder icon in session detail panel
- Verify that folder opener works for the vfolder you clicked on (name, contents, etc. match)

**Checklist:** (if applicable)

- [ ] Documentation
- [ ] Minium required manager version
- [ ] Specific setting for review (eg., KB link, endpoint or how to setup)
- [ ] Minimum requirements to check during review
- [ ] Test case(s) to demonstrate the difference of before/after