CPS-628 Fix Django Admin link to investment project record on FE

[swenban]

Description of change

The VIEW ON SITE button on the Change investment project page in Django Admin should take the user to the project page on the frontend of Data Hub. Instead of displaying the project, users are currently seeing a Page not found error message. This is because '/details' is missing from the end of the url link.
This PR corrects the issue.

To test

• In Django Admin scroll down to INVESTMENT and select Investment Projects
• Select a project
• Click on the VIEW ON SITE button in the top right

• The relevant investment project page on Data Hub should be displayed without errors

Checklist

• Has this branch been rebased on top of the current main branch?

  Explanation

  The branch should not be stale or have conflicts at the time reviews are requested.

• Is the CircleCI build passing?

General points

Other things to check

• Make sure fixtures/test_data.yaml is maintained when updating models
• Consider the admin site when making changes to models
• Use select-/prefetch-related field lists in views and search apps, and update them when fields are added
• Make sure the README is updated e.g. when adding new environment variables

See docs/CONTRIBUTING.md for more guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.48%. Comparing base (7f3d486) to head (13b2ac3).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5795   +/-   ##
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  Coverage   96.47%   96.48%           
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  Files        1037     1037           
  Lines       24625    24625           
  Branches     1637     1637           
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+ Hits        23758    23759    +1     
+ Misses        710      709    -1     
  Partials      157      157           

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