fix: hide team webhooks from users (#1116)

## Description

Currently if you create a team webhook, you can see it in your personal
webhooks.

However, interacting with them will throw errors because there is server
side logic preventing any interaction with them since they are outside
of the correct context.

So the solution is to either:
- Allow the user to edit the team webhooks that they created on their
personal webhooks page
- Hide team webhooks for personal webhooks pages

This PR goes with the second option, but is open to suggestions.

packages/lib/server-only/webhooks/get-webhooks-by-user-id.ts

@@ -4,6 +4,7 @@ export const getWebhooksByUserId = async (userId: number) => {
   return await prisma.webhook.findMany({
     where: {
       userId,
+      teamId: null,
     },
     orderBy: {
       createdAt: 'desc',