Fallback to default value when migrating value from enum (#6517)

When migrating the option values of a select type, if the field is non
nullable (for now, only available for opportunity's "stage" standard
field), we fallback to the (potentially updated) default value instead
of nullifying the value to avoid getting a database error.

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

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

@@ -0,0 +1,42 @@
+import { FieldMetadataDefaultSerializableValue } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata-default-value.interface';
+
+export const unserializeDefaultValue = (
+  serializedDefaultValue: FieldMetadataDefaultSerializableValue,
+): any => {
+  if (serializedDefaultValue === null) {
+    return null;
+  }
+
+  if (typeof serializedDefaultValue === 'number') {
+    return serializedDefaultValue;
+  }
+
+  if (typeof serializedDefaultValue === 'boolean') {
+    return serializedDefaultValue;
+  }
+
+  if (typeof serializedDefaultValue === 'string') {
+    return serializedDefaultValue.replace(/'/g, '');
+  }
+
+  if (Array.isArray(serializedDefaultValue)) {
+    return serializedDefaultValue.map((value) =>
+      unserializeDefaultValue(value),
+    );
+  }
+
+  if (typeof serializedDefaultValue === 'object') {
+    return Object.entries(serializedDefaultValue).reduce(
+      (acc, [key, value]) => {
+        acc[key] = unserializeDefaultValue(value);
+
+        return acc;
+      },
+      {},
+    );
+  }
+
+  throw new Error(
+    `Invalid serialized default value "${serializedDefaultValue}"`,
+  );
+};