fix: improve error message when deleting organization with resources (#17049)

Closes
[coder/internal#477](https://github.com/coder/internal/issues/477)

![Screenshot 2025-03-21 at 11 25
57 AM](https://github.com/user-attachments/assets/50cc03e9-395d-4fc7-8882-18cb66b1fac9)

I'm solving this issue in two parts:

1. Updated the postgres function so that it doesn't omit 0 values in the
error
2. Created a new query to fetch the number of resources associated with
an organization and using that information to provider a cleaner error
message to the frontend

> **_NOTE:_** SQL is not my strong suit, and the code was created with
the help of AI. So I'd take extra time looking over what I wrote there

coderd/database/querier_test.go

@@ -3507,7 +3507,6 @@ func TestOrganizationDeleteTrigger(t *testing.T) {
 		require.Error(t, err)
 		// cannot delete organization: organization has 0 workspaces and 1 templates that must be deleted first
 		require.ErrorContains(t, err, "cannot delete organization")
-		require.ErrorContains(t, err, "has 0 workspaces")
 		require.ErrorContains(t, err, "1 templates")
 	})