feat(eventuser): Delete ProjectUserDetailsEndpoint (#59180)

## Objective:

Deletes ProjectUserDetailsEndpoint GET and DELETE endpoints. 

We have not had a request to both these endpoints in the past 365 days.
Redash query
[here](https://redash.getsentry.net/queries/5158?p_days=365).

Author: NisanthanNanthakumar

src/sentry/api/endpoints/project_user_details.py

@@ -529,7 +529,6 @@
     ProjectTransactionThresholdOverrideEndpoint,
 )
 from .endpoints.project_transfer import ProjectTransferEndpoint
-from .endpoints.project_user_details import ProjectUserDetailsEndpoint
 from .endpoints.project_user_reports import ProjectUserReportsEndpoint
 from .endpoints.project_user_stats import ProjectUserStatsEndpoint
 from .endpoints.project_users import ProjectUsersEndpoint
@@ -2411,11 +2410,6 @@
         ProjectUsersEndpoint.as_view(),
         name="sentry-api-0-project-users",
     ),
-    re_path(
-        r"^(?P<organization_slug>[^\/]+)/(?P<project_slug>[^\/]+)/users/(?P<user_hash>[^/]+)/$",
-        ProjectUserDetailsEndpoint.as_view(),
-        name="sentry-api-0-project-user-details",
-    ),
     re_path(
         r"^(?P<organization_slug>[^\/]+)/(?P<project_slug>[^\/]+)/(?:user-feedback|user-reports)/$",
         ProjectUserReportsEndpoint.as_view(),