Use updating page from frontend

packages/client/src/components/UpdatingApp.svelte

@@ -1,61 +1,15 @@
 <script>
+  import { Updating } from "@budibase/frontend-core"
   import { API } from "../api"
 
-  const timeoutMs = 60000 // 1 minute
-  const loadTime = Date.now()
-
-  let timedOut = false
-
-  async function checkMigrationsFinished() {
-    setTimeout(async () => {
-      const response = await API.getMigrationStatus()
-      if (!response.migrated) {
-        if (loadTime + timeoutMs > Date.now()) {
-          return checkMigrationsFinished()
-        }
-        return migrationTimeout()
-      }
-
-      window.location.reload()
-    }, 1000)
+  async function isMigrationDone() {
+    const response = await API.getMigrationStatus()
+    return response.migrated
   }
 
-  checkMigrationsFinished()
-
-  function migrationTimeout() {
-    timedOut = true
+  async function onMigrationDone() {
+    window.location.reload()
   }
 </script>
 
-<div class="loading">
-  {#if !timedOut}
-    <p class="loading-message">
-      🛠️ We are updating the system. <br />Please wait, we will be back in a
-      second!
-    </p>
-  {:else}
-    <p class="loading-message timeout">
-      An error occurred. Please try again later.
-    </p>
-  {/if}
-</div>
-
-<style>
-  .loading {
-    display: flex;
-    justify-content: center;
-    align-items: center;
-    justify-content: center;
-    flex-direction: column;
-    gap: var(--spacing-xl);
-    height: 100vh;
-    margin: 0;
-  }
-  .loading-message {
-    text-align: center;
-    font-size: 18px;
-  }
-  .timeout {
-    color: rgb(196, 46, 46);
-  }
-</style>
+<Updating {isMigrationDone} {onMigrationDone} />