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/engine/twenty-orm/utils/compute-relation-connect-query-configs.util.ts

@@ -1,7 +1,10 @@
 import { msg } from '@lingui/core/macro';
-import deepEqual from 'deep-equal';
 import { FieldMetadataType } from 'twenty-shared/types';
-import { getUniqueConstraintsFields, isDefined } from 'twenty-shared/utils';
+import {
+  fastDeepEqual,
+  getUniqueConstraintsFields,
+  isDefined,
+} from 'twenty-shared/utils';
 
 import { RelationType } from 'src/engine/metadata-modules/field-metadata/interfaces/relation-type.interface';
 
@@ -326,7 +329,7 @@ const checkUniqueConstraintsAreSameOrThrow = (
   uniqueConstraintFields: FlatFieldMetadata<FieldMetadataType>[],
 ) => {
   if (
-    !deepEqual(
+    !fastDeepEqual(
       relationConnectQueryConfig.uniqueConstraintFields,
       uniqueConstraintFields,
     )