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/dbmem/dbmem.go

@@ -4008,6 +4008,54 @@ func (q *FakeQuerier) GetOrganizationIDsByMemberIDs(_ context.Context, ids []uui
 	return getOrganizationIDsByMemberIDRows, nil
 }
 
+func (q *FakeQuerier) GetOrganizationResourceCountByID(_ context.Context, organizationID uuid.UUID) (database.GetOrganizationResourceCountByIDRow, error) {
+	q.mutex.RLock()
+	defer q.mutex.RUnlock()
+
+	workspacesCount := 0
+	for _, workspace := range q.workspaces {
+		if workspace.OrganizationID == organizationID {
+			workspacesCount++
+		}
+	}
+
+	groupsCount := 0
+	for _, group := range q.groups {
+		if group.OrganizationID == organizationID {
+			groupsCount++
+		}
+	}
+
+	templatesCount := 0
+	for _, template := range q.templates {
+		if template.OrganizationID == organizationID {
+			templatesCount++
+		}
+	}
+
+	organizationMembersCount := 0
+	for _, organizationMember := range q.organizationMembers {
+		if organizationMember.OrganizationID == organizationID {
+			organizationMembersCount++
+		}
+	}
+
+	provKeyCount := 0
+	for _, provKey := range q.provisionerKeys {
+		if provKey.OrganizationID == organizationID {
+			provKeyCount++
+		}
+	}
+
+	return database.GetOrganizationResourceCountByIDRow{
+		WorkspaceCount:      int64(workspacesCount),
+		GroupCount:          int64(groupsCount),
+		TemplateCount:       int64(templatesCount),
+		MemberCount:         int64(organizationMembersCount),
+		ProvisionerKeyCount: int64(provKeyCount),
+	}, nil
+}
+
 func (q *FakeQuerier) GetOrganizations(_ context.Context, args database.GetOrganizationsParams) ([]database.Organization, error) {
 	q.mutex.RLock()
 	defer q.mutex.RUnlock()