fix django-app-helper link in the docs

[bckohan]

Description

Very simple documentation link update. The link for django-app-helper on the tests page is stale.

Related resources

N/A

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the django-app-helper hyperlink in the testing documentation to point to the correct target URL.

File-Level Changes

Change	Details	Files
Correct the django-app-helper documentation link in the testing docs.	Update the django-app-helper hyperlink URL to the correct destination in the running tests documentation Ensure the link text and reStructuredText link syntax remain consistent with surrounding docs	docs/running_tests.rst

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.95%. Comparing base (056ebda) to head (ecdcdcb).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1570   +/-   ##
=======================================
  Coverage   76.95%   76.95%           
=======================================
  Files          77       77           
  Lines        3666     3666           
  Branches      498      498           
=======================================
  Hits         2821     2821           
  Misses        675      675           
  Partials      170      170           

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