chore: running paid subscription e2e tests on both self-hosted and home-server setup (#2355)

* chore: add activating paid subscription in e2e on both self-hosted and home-server setup

* chore: fix activating premium features on e2e test suites

* chore: remove unnecessary sleep duplication

* chore: add defining the subscription expires at date in e2e

packages/snjs/mocha/lib/HomeServer.js

@@ -0,0 +1,16 @@
+import * as Defaults from './Defaults.js'
+
+export async function activatePremiumFeatures(username, subscriptionPlanName, endsAt) {
+  await fetch(`${Defaults.getDefaultHost()}/e2e/activate-premium`, {
+    method: 'POST',
+    headers: {
+      Accept: 'application/json',
+      'Content-Type': 'application/json',
+    },
+    body: JSON.stringify({
+      username,
+      subscriptionPlanName,
+      endsAt,
+    }),
+  })
+}