Allow users to delete their only project

The restriction preventing users from deleting
their only project was originally introduced
because the UI could not function correctly
without projects, which is no longer the case.

Author: jvstme

src/dstack/_internal/server/services/projects.py

@@ -199,8 +199,6 @@ async def delete_projects(
         for project in projects_to_delete:
             if not _is_project_admin(user=user, project=project):
                 raise ForbiddenError()
-        if all(name in projects_names for name in user_project_names):
-            raise ServerClientError("Cannot delete the only project")
 
     res = await session.execute(
         select(ProjectModel)

src/tests/_internal/server/routers/test_projects.py

@@ -453,7 +453,7 @@ async def test_returns_40x_if_not_authenticated(self, test_db, client: AsyncClie
 
     @pytest.mark.asyncio
     @pytest.mark.parametrize("test_db", ["sqlite", "postgres"], indirect=True)
-    async def test_cannot_delete_the_only_project(
+    async def test_deletes_the_only_project(
         self, test_db, session: AsyncSession, client: AsyncClient
     ):
         user = await create_user(session=session, global_role=GlobalRole.USER)
@@ -466,9 +466,9 @@ async def test_cannot_delete_the_only_project(
             headers=get_auth_headers(user.token),
             json={"projects_names": [project.name]},
         )
-        assert response.status_code == 400
+        assert response.status_code == 200
         await session.refresh(project)
-        assert not project.deleted
+        assert project.deleted
 
     @pytest.mark.asyncio
     @pytest.mark.parametrize("test_db", ["sqlite", "postgres"], indirect=True)