fix: Issues observed when inviting members to organization either through teams migration during onboarding or explicit user invite (calcom#22901)

* fix: make team migrations sequential to avoid race conditions

Instead of processing team migrations in parallel using Promise.all,
process them sequentially to avoid race conditions when creating
profiles and memberships for team members.

This simplifies the implementation and avoids the need for complex
retry logic or database-level concurrency controls.

* Promise.all accepts an array of promises and not an array with array in it as the first item. This fixes the issue where these promises were unhandled

* Fix the issue where an existing pending membership with team stays pending even though theorganization membership gets created as accepted

Author: hariombalhara

packages/trpc/server/routers/viewer/organizations/createTeams.handler.ts

@@ -95,21 +95,18 @@ export const createTeamsHandler = async ({ ctx, input }: CreateTeamsOptions) =>
     teamNames.map((item) => slugify(item)).includes(slug)
   );
 
-  await Promise.all(
-    moveTeams
-      .filter((team) => team.shouldMove)
-      .map(async ({ id: teamId, newSlug }) => {
-        await moveTeam({
-          teamId,
-          newSlug,
-          org: {
-            ...organization,
-            ownerId: organizationOwner.id,
-          },
-          creationSource,
-        });
-      })
-  );
+  // Process team migrations sequentially to avoid race conditions - Moving a team invites members to the organization again and there are known unique constraints failure in membership and profile creation if done in parallel and a user happens to be part of more than one team
+  for (const team of moveTeams.filter((team) => team.shouldMove)) {
+    await moveTeam({
+      teamId: team.id,
+      newSlug: team.newSlug,
+      org: {
+        ...organization,
+        ownerId: organizationOwner.id,
+      },
+      creationSource,
+    });
+  }
 
   if (duplicatedSlugs.length === teamNames.length) {
     return { duplicatedSlugs };