refactor Stripe webhook (#200)

* rename TierIds to PaymentPlanIds

* refactor webhook and util functions

* pass userDelegate to function

* Update dbSeeds.ts

* update app diff

* Update template/app/src/server/stripe/stripeClient.ts

Co-authored-by: Martin Šošić <Martinsos@users.noreply.github.com>

* extract event handlers and more

* Update AccountPage.tsx

* address filips pro effective typescripting and stuff

* Martin's attempt at consolidating types.

* fix

* fix webhook events and validation

* small changes

* put stripe event handlers back for marty merge

* merge consilidated types from martin

* move some types around

* add docs for stripe api version

* Update AccountPage.tsx

* Update stripe.ts

* update SubscriptionStatus type

* Update actions.ts

* add assertUnreachable util

* more small changes

* Update deploying.md

* update accountPage and docs

* update app_diff

---------

Co-authored-by: Martin Šošić <Martinsos@users.noreply.github.com>
Co-authored-by: Martin Sosic <sosic.martin@gmail.com>

opensaas-sh/app_diff/src/server/scripts/dbSeeds.ts.diff

@@ -1,9 +1,11 @@
 --- template/app/src/server/scripts/dbSeeds.ts
 +++ opensaas-sh/app/src/server/scripts/dbSeeds.ts
-@@ -43,5 +43,6 @@
+@@ -42,5 +42,8 @@
      datePaid: hasUserPaidOnStripe ? faker.date.between({ from: createdAt, to: lastActiveTimestamp }) : null,
      checkoutSessionId: hasUserPaidOnStripe ? `cs_test_${faker.string.uuid()}` : null,
-     subscriptionTier: subscriptionStatus ? faker.helpers.arrayElement([TierIds.HOBBY, TierIds.PRO]) : null,
+     subscriptionPlan: subscriptionStatus ? faker.helpers.arrayElement(getSubscriptionPaymentPlanIds()) : null,
++    // For the demo app, we want to default isMockUser to true so that our admin dash only shows mock users
++    // and not real users signing up to test the app
 +    isMockUser: true,
    };
  }