Fix sentry error (#5848)

Fixes
https://twenty-v7.sentry.io/issues/5363536663/?environment=prod&project=4507072499810304&query=is%3Aunresolved+issue.priority%3A%5Bhigh%2C+medium%5D&referrer=issue-stream&statsPeriod=7d&stream_index=0

- handle error properly in twenty-server
- display backend error message

packages/twenty-front/src/modules/auth/sign-in-up/hooks/useWorkspaceFromInviteHash.ts

@@ -22,8 +22,8 @@ export const useWorkspaceFromInviteHash = () => {
   const { data: workspaceFromInviteHash, loading } =
     useGetWorkspaceFromInviteHashQuery({
       variables: { inviteHash: workspaceInviteHash || '' },
-      onError: () => {
+      onError: (error) => {
-        enqueueSnackBar('workspace does not exist', {
+        enqueueSnackBar(error.message, {
           variant: SnackBarVariant.Error,
         });
         navigate(AppPath.Index);

packages/twenty-server/src/engine/core-modules/auth/auth.resolver.ts

@@ -82,9 +82,15 @@ export class AuthResolver {
   async findWorkspaceFromInviteHash(
     @Args() workspaceInviteHashValidInput: WorkspaceInviteHashValidInput,
   ) {
-    return await this.workspaceRepository.findOneBy({
+    const workspace = await this.workspaceRepository.findOneBy({
       inviteHash: workspaceInviteHashValidInput.inviteHash,
     });
+
+    if (!workspace) {
+      throw new BadRequestException('Workspace does not exist');
+    }
+
+    return workspace;
   }
 
   @UseGuards(CaptchaGuard)