FlatObjectMetadataMaps utils coverage (#13695)

# Introduction
```ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/add-flat-field-metadata-in-flat-object-metadata-maps-or-throw.spec.ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/delete-field-from-flat-object-metadata-maps-or-throw.spec.ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/find-flat-field-metadata-in-flat-object-metadata-maps.spec.ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/replace-flat-object-metadata-in-flat-object-metadata-maps-or-throw.spec.ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/replace-flat-field-metadata-in-flat-object-metadata-maps-or-throw.spec.ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/find-flat-object-metadata-in-flat-object-metadata-maps.spec.ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/add-flat-object-metadata-to-flat-object-metadata-maps-or-throw.spec.ts
 PASS   twenty-server  src/engine/metadata-modules/flat-object-metadata-maps/utils/__tests__/delete-object-from-flat-object-metadata-maps-or-throw.spec.ts

=============================== Coverage summary ===============================
Statements   : 0.43% ( 159/36564 )
Branches     : 0.16% ( 26/16182 )
Functions    : 0.27% ( 25/9110 )
Lines        : 0.4% ( 142/35006 )
================================================================================

Test Suites: 8 passed, 8 total
Tests:       20 passed, 20 total
Snapshots:   9 passed, 9 total
Time:        7.639 s
```

## Tests utils
Introduced three tests utils:
- expect-flat-field-metadata-to-be-in-flat-object-metadata-maps.util
-
expect-flat-object-metadata-to-strictly-be-in-flat-object-metadata-maps.util
- expect-to-be-defined.util

packages/twenty-server/src/engine/metadata-modules/field-metadata/utils/generate-default-value.ts

@@ -4,22 +4,23 @@ import { FieldMetadataDefaultValue } from 'src/engine/metadata-modules/field-met
 
 import { FieldActorSource } from 'src/engine/metadata-modules/field-metadata/composite-types/actor.composite-type';
 
+// No need to refactor as unused in workspace migration v2
 export function generateDefaultValue(
   type: FieldMetadataType,
 ): FieldMetadataDefaultValue {
   switch (type) {
     case FieldMetadataType.TEXT:
-      return "''";
+      return "''" satisfies FieldMetadataDefaultValue<FieldMetadataType.TEXT>;
     case FieldMetadataType.EMAILS:
       return {
         primaryEmail: "''",
         additionalEmails: null,
-      };
+      } satisfies FieldMetadataDefaultValue<FieldMetadataType.EMAILS>;
     case FieldMetadataType.FULL_NAME:
       return {
         firstName: "''",
         lastName: "''",
-      };
+      } satisfies FieldMetadataDefaultValue<FieldMetadataType.FULL_NAME>;
     case FieldMetadataType.ADDRESS:
       return {
         addressStreet1: "''",
@@ -30,36 +31,31 @@ export function generateDefaultValue(
         addressPostcode: "''",
         addressLat: null,
         addressLng: null,
-      };
+      } satisfies FieldMetadataDefaultValue<FieldMetadataType.ADDRESS>;
     case FieldMetadataType.CURRENCY:
       return {
         amountMicros: null,
         currencyCode: "''",
-      };
+      } satisfies FieldMetadataDefaultValue<FieldMetadataType.CURRENCY>;
     case FieldMetadataType.LINKS:
       return {
         primaryLinkLabel: "''",
         primaryLinkUrl: "''",
-        secondaryLinks: "'[]'",
-      };
+        secondaryLinks: null,
+      } satisfies FieldMetadataDefaultValue<FieldMetadataType.LINKS>;
     case FieldMetadataType.PHONES:
       return {
         primaryPhoneNumber: "''",
         primaryPhoneCountryCode: "''",
         primaryPhoneCallingCode: "''",
         additionalPhones: null,
-      };
-    case FieldMetadataType.RICH_TEXT_V2:
-      return {
-        blocknote: "''",
-        markdown: "''",
-      };
+      } satisfies FieldMetadataDefaultValue<FieldMetadataType.PHONES>;
     case FieldMetadataType.ACTOR:
       return {
         source: `'${FieldActorSource.MANUAL}'`,
         name: "'System'",
-        context: {},
-      };
+        workspaceMemberId: null,
+      } satisfies FieldMetadataDefaultValue<FieldMetadataType.ACTOR>;
     default:
       return null;
   }