ci: don't run requests-hpc-tests on main

[NicholasBlaskey]

Ticket

Description

HPC approval is just spinning on main

https://github.com/determined-ai/determined/runs/24565380530

Stop this in the future

Test Plan

no testing

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.

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	dc80032
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/66354655a100830008893f4e

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.63%. Comparing base (4c314a2) to head (dc80032).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9308      +/-   ##
==========================================
+ Coverage   44.24%   44.63%   +0.38%     
==========================================
  Files        1275     1275              
  Lines      156260   156261       +1     
  Branches     2449     2450       +1     
==========================================
+ Hits        69144    69740     +596     
+ Misses      86876    86281     -595     
  Partials      240      240              

Flag	Coverage Δ
backend	41.83% <ø> (+<0.01%)	⬆️
harness	64.08% <ø> (+1.48%)	⬆️
web	35.04% <ø> (ø)

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

see 13 files with indirect coverage changes

[dannysauer]

Seems reasonable.