fix: replace slow deep-equal with fastDeepEqual to resolve CPU bottleneck (#19771)

## Summary

- Replaced the `deep-equal` npm package with the existing
`fastDeepEqual` from `twenty-shared/utils` across 5 files in the server
and shared packages
- `deep-equal` was causing severe CPU overhead in the record update hot
path (`executeMany` → `formatTwentyOrmEventToDatabaseBatchEvent` →
`objectRecordChangedValues` → `deepEqual`, called **per field per
record**)
- `fastDeepEqual` is ~100x faster for plain JSON database records since
it skips unnecessary prototype chain inspection and edge-case handling
- Removed the now-unnecessary `LARGE_JSON_FIELDS` branching in
`objectRecordChangedValues` since all fields now use the fast
implementation

packages/twenty-server/src/modules/messaging/message-folder-manager/utils/compute-folders-to-update.util.ts

@@ -1,5 +1,5 @@
 import { isNonEmptyString } from '@sniptt/guards';
-import deepEqual from 'deep-equal';
+import { fastDeepEqual } from 'twenty-shared/utils';
 
 import {
   type DiscoveredMessageFolder,
@@ -62,7 +62,7 @@ export const computeFoldersToUpdate = ({
         : null,
     };
 
-    if (!deepEqual(discoveredFolderData, existingFolderData)) {
+    if (!fastDeepEqual(discoveredFolderData, existingFolderData)) {
       foldersToUpdate.set(existingFolder.id, discoveredFolderData);
     }
   }