CPS-628 Fix Django Admin link to investment project record on FE (#5795)

* Add /details to FE investment project url

Author: swenban

datahub/investment/project/models.py

@@ -607,7 +607,7 @@ def __init__(self, *args, **kwargs):
 
     def get_absolute_url(self):
         """URL to the object in the Data Hub internal front end."""
-        return get_front_end_url(self)
+        return f'{get_front_end_url(self)}/details'
 
     def save(self, *args, **kwargs):
         """Updates the stage log after saving.

datahub/investment/project/test/test_models.py

@@ -48,7 +48,7 @@ def test_interaction_get_absolute_url():
     """Test that InvestmentProject.get_absolute_url() returns the correct URL."""
     project = InvestmentProjectFactory.build()
     assert project.get_absolute_url() == (
-        f'{settings.DATAHUB_FRONTEND_URL_PREFIXES["investmentproject"]}/{project.pk}'
+        f'{settings.DATAHUB_FRONTEND_URL_PREFIXES["investmentproject"]}/{project.pk}/details'
     )