feat: add GET global config policies API

[salonig23]

Ticket

Description

Added GET global config policies API endpoint

Test Plan

Added automated test

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	6b04939
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/66eb489cd810780008495274

[codecov]

Codecov Report

Attention: Patch coverage is 23.07692% with 20 lines in your changes missing coverage. Please review.

Project coverage is 54.51%. Comparing base (88a4c67) to head (6b04939).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
master/internal/api_config_policies.go	25.00%	18 Missing ⚠️
...ternal/configpolicy/postgres_task_config_policy.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9952      +/-   ##
==========================================
- Coverage   54.52%   54.51%   -0.02%     
==========================================
  Files        1252     1252              
  Lines      156688   156704      +16     
  Branches     3600     3600              
==========================================
- Hits        85435    85423      -12     
- Misses      71120    71148      +28     
  Partials      133      133              

Flag	Coverage Δ
backend	45.18% <23.07%> (-0.04%)	⬇️
harness	72.75% <ø> (ø)
web	54.27% <ø> (ø)

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

Files with missing lines	Coverage Δ
...ternal/configpolicy/postgres_task_config_policy.go	89.28% <0.00%> (-3.31%)	⬇️
master/internal/api_config_policies.go	47.78% <25.00%> (-13.83%)	⬇️

... and 3 files with indirect coverage changes

[kkunapuli]

LGTM! I like the refactor with GetConfigPolicies.

[amandavialva01]

Looks awesome! Left a few comments 🎉

[amandavialva01]

LGTM! Awesome work Saloni!