chore: Deprecate model hub

[MikhailKardash]

Ticket

https://hpe-aiatscale.atlassian.net/browse/MD-32

Docs

#9666

Description

Officially deprecate Model Hub with removal planned in the next release.

Test Plan

None

Checklist

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

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	cbbd789
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/6696de162b1cfc00083a36f9

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.91%. Comparing base (3a8c042) to head (cbbd789).
Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9628      +/-   ##
==========================================
- Coverage   52.91%   52.91%   -0.01%     
==========================================
  Files        1255     1255              
  Lines      153215   153219       +4     
  Branches     3245     3244       -1     
==========================================
- Hits        81081    81079       -2     
- Misses      71983    71989       +6     
  Partials      151      151              

Flag	Coverage Δ
backend	44.00% <ø> (-0.01%)	⬇️
harness	72.76% <75.00%> (+<0.01%)	⬆️
web	51.36% <ø> (ø)

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

Files	Coverage Δ
model_hub/model_hub/mmdetection/_trial.py	49.65% <100.00%> (+0.71%)	⬆️
model_hub/model_hub/huggingface/_trial.py	23.07% <50.00%> (+0.60%)	⬆️

... and 3 files with indirect coverage changes

[tara-hpe]

LGTM