feat: add multi subscription support (#734)

## Description

Previously we assumed that there can only be 1 subscription per user.
However, that will soon no longer the case with the introduction of the
Teams subscription.

This PR will apply the required migrations to support multiple
subscriptions.

## Changes Made

- Updated the Prisma schema to allow for multiple `Subscriptions` per
`User`
- Added a Stripe `customerId` field to the `User` model
- Updated relevant billing sections to support multiple subscriptions

## Testing Performed

- Tested running the Prisma migration on a demo database created on the
main branch

Will require a lot of additional testing.

## Checklist

- [ ] I have tested these changes locally and they work as expected.
- [ ] I have added/updated tests that prove the effectiveness of these
changes.
- [X] I have followed the project's coding style guidelines.

## Additional Notes

Added the following custom SQL statement to the migration:

> DELETE FROM "Subscription" WHERE "planId" IS NULL OR "priceId" IS
NULL;

Prior to deployment this will require changes to Stripe products:
- Adding `type` meta attribute

---------

Co-authored-by: Lucas Smith <me@lucasjamessmith.me>

apps/marketing/src/components/(marketing)/pricing-table.tsx

@@ -1,9 +1,9 @@
 'use client';
 
-import { HTMLAttributes, useState } from 'react';
+import type { HTMLAttributes } from 'react';
+import { useState } from 'react';
 
 import Link from 'next/link';
-import { useSearchParams } from 'next/navigation';
 
 import { AnimatePresence, motion } from 'framer-motion';
 import { usePlausible } from 'next-plausible';
@@ -16,14 +16,9 @@ export type PricingTableProps = HTMLAttributes<HTMLDivElement>;
 const SELECTED_PLAN_BAR_LAYOUT_ID = 'selected-plan-bar';
 
 export const PricingTable = ({ className, ...props }: PricingTableProps) => {
-  const params = useSearchParams();
   const event = usePlausible();
 
-  const [period, setPeriod] = useState<'MONTHLY' | 'YEARLY'>(() =>
-    params?.get('planId') === process.env.NEXT_PUBLIC_STRIPE_COMMUNITY_PLAN_YEARLY_PRICE_ID
-      ? 'YEARLY'
-      : 'MONTHLY',
-  );
+  const [period, setPeriod] = useState<'MONTHLY' | 'YEARLY'>('MONTHLY');
 
   return (
     <div className={cn('', className)} {...props}>