Deprecate legacy encryption (#21831)

# Introduction
Still preserving the cross-upgrade flow

close https://github.com/twentyhq/core-team-issues/issues/2465


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packages/twenty-server/src/engine/core-modules/jwt/services/jwt-key-manager.service.ts

@@ -191,7 +191,9 @@ export class JwtKeyManagerService {
       );
     }
 
-    return this.secretEncryptionService.decryptVersioned(encryptedPrivateKey);
+    return this.secretEncryptionService.decryptVersionedOrThrow(
+      encryptedPrivateKey,
+    );
   }
 
   private async generateAndPersistCurrent(): Promise<CurrentSigningKey> {