Fix unique standard field (#16371)

Fixes https://github.com/twentyhq/twenty/issues/15925

- update field metadata update logic
- uniformize the way index are named
- command to migrate v1-named unique index
- add integration testing

---------

Co-authored-by: prastoin <paul@twenty.com>

.vscode/launch.json

@@ -67,7 +67,7 @@
         "--config",
         "./jest-integration.config.ts",
         "${relativeFile}",
-        "--silent=false"
+        "--silent=false",
       ],
       "cwd": "${workspaceFolder}/packages/twenty-server",
       "console": "integratedTerminal",