[FIX] Optimistically compute position only for objectMetadataItem that has the field (#10510)

# Introduction
In this PR https://github.com/twentyhq/twenty/pull/10493 introduced a
regression on optimistic cache for record creation, by expecting a
`position` `fieldMetadataItem` on every `ObjectMetadataItem` which is a
wrong assertion
Some `Tasks` and `ApiKeys` do not have one

## Fix
Dynamically compute optimistic record input position depending on
current `ObjectMetadataItem`

## Refactor
Refactored a failing test following [jest
each](https://jestjs.io/docs/api#describeeachtablename-fn-timeout)
pattern to avoid error prone duplicated env tests. Created a "standard'
and applied it to an other test also using `it.each`.

packages/twenty-front/src/modules/object-record/utils/computeOptimisticCreateRecordBaseRecordInput.ts

@@ -0,0 +1,24 @@
+import { ObjectMetadataItem } from '@/object-metadata/types/ObjectMetadataItem';
+import { hasObjectMetadataItemFieldCreatedBy } from '@/object-metadata/utils/hasObjectMetadataItemFieldCreatedBy';
+import { hasObjectMetadataItemPositionField } from '@/object-metadata/utils/hasObjectMetadataItemPositionField';
+import { FieldActorForInputValue } from '@/object-record/record-field/types/FieldMetadata';
+import { ObjectRecord } from '@/object-record/types/ObjectRecord';
+
+export const computeOptimisticCreateRecordBaseRecordInput = (
+  objectMetadataItem: ObjectMetadataItem,
+) => {
+  const baseRecordInput: Partial<ObjectRecord> = {};
+
+  if (hasObjectMetadataItemFieldCreatedBy(objectMetadataItem)) {
+    baseRecordInput.createdBy = {
+      source: 'MANUAL',
+      context: {},
+    } satisfies FieldActorForInputValue;
+  }
+
+  if (hasObjectMetadataItemPositionField(objectMetadataItem)) {
+    baseRecordInput.position = Number.NEGATIVE_INFINITY;
+  }
+
+  return baseRecordInput;
+};