feat: support for configuring the shared_fs mount path in genai

[tayritenour]

Ticket

GAS-14

Description

Allows us to pass a mount path for the shared_fs drive in genai. This makes it possible to use shared_fs for checkpoints and for datasets without necessarily using the same disk.

Test Plan

No need to test in release party. The GenAI team is testing separately.

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.63%. Comparing base (a76c549) to head (49063bc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9317   +/-   ##
=======================================
  Coverage   44.63%   44.63%           
=======================================
  Files        1275     1275           
  Lines      156285   156286    +1     
  Branches     2450     2449    -1     
=======================================
+ Hits        69757    69758    +1     
  Misses      86288    86288           
  Partials      240      240           

Flag	Coverage Δ
backend	41.82% <ø> (ø)
harness	64.10% <100.00%> (+<0.01%)	⬆️
web	35.04% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
harness/determined/deploy/aws/cli.py	16.86% <ø> (ø)
harness/determined/deploy/aws/constants.py	100.00% <100.00%> (ø)
...ess/determined/deploy/aws/deployment_types/base.py	39.74% <ø> (ø)

... and 4 files with indirect coverage changes