fixing index on relations (#12602)

## Why

After the changes on relations, index on relations were skipped by the
syncmetadata service, so no more migrations were generated for relation
fields.

We wanted to fix this.


## Test

This PR adds unit tests for the `createIndexMigration` utility in the
workspace migration builder. The tests cover:

- Creating index migrations for simple fields (e.g., text fields)
- Creating index migrations for relation fields (ensuring correct column
naming, e.g., `authorId` for the `author` objectmetadataname)


## Excluded
The delete index on relation does not need the column names so i don't
think i needed to work on this method. I might be wrong.


## Checklist

- [x] Added/updated unit tests for index migration creation
- [x] Verified correct handling of simple and relation fields
- [x] Ensured all tests pass

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>
Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/utils/compute-object-target-table.util.ts

@@ -3,7 +3,7 @@ import { ObjectMetadataInterface } from 'src/engine/metadata-modules/field-metad
 import { computeTableName } from './compute-table-name.util';
 
 export const computeObjectTargetTable = (
-  objectMetadata: ObjectMetadataInterface,
+  objectMetadata: Pick<ObjectMetadataInterface, 'nameSingular' | 'isCustom'>,
 ) => {
   return computeTableName(objectMetadata.nameSingular, objectMetadata.isCustom);
 };

packages/twenty-server/src/engine/utils/is-field-metadata-of-type.util.ts

@@ -8,7 +8,7 @@ export function isFieldMetadataInterfaceOfType<
   Field extends FieldMetadataInterface<FieldMetadataType>,
   Type extends FieldMetadataType,
 >(
-  fieldMetadata: Field,
+  fieldMetadata: Pick<Field, 'type'>,
   type: Type,
 ): fieldMetadata is Field & FieldMetadataInterface<Type> {
   return fieldMetadata.type === type;
@@ -18,7 +18,7 @@ export function isFieldMetadataEntityOfType<
   Field extends FieldMetadataEntity<FieldMetadataType>,
   Type extends FieldMetadataType,
 >(
-  fieldMetadata: Field,
+  fieldMetadata: Pick<Field, 'type'>,
   type: Type,
 ): fieldMetadata is Field & FieldMetadataEntity<Type> {
   return fieldMetadata.type === type;