[TEST] Covering useDeleteOne relations optimistic cache behavior (#10238)

## Introduction
Added coverage on the `useDeleteOneRecord` hooks, especially its
optimistic behavior feature.
Introduced a new testing tool `InMemoryTestingCacheInstance` that has
builtin very basic expectors in order to avoid future duplication when
covering others record hooks `update, create, destroy` etc etc

## Notes
Added few comments in this PR regarding some builtin functions I've
created around companies and people mocked object model and that I think
could be cool to spread and centralize within a dedicated "class
template"

Also put in light that unless I'm mistaken some tests are running on
`RecordNode` and not `RecordObject`

Took few directions on my own that as I always I would suggestion nor
remarks on them !

Let me know

## Misc
- Should we refactor `useDeleteOneRecord` tests to follow `eachTesting`
pattern ? => I feel like this is inappropriate as this hooks is already
high level, the only plus value would be less tests code despite
readability IMO

packages/twenty-front/src/modules/object-record/graphql/utils/__tests__/computeDepthOneRecordGqlFieldsFromRecord.test.ts

@@ -1,13 +1,13 @@
 import { computeDepthOneRecordGqlFieldsFromRecord } from '@/object-record/graphql/utils/computeDepthOneRecordGqlFieldsFromRecord';
 import {
-  getPersonObjectMetadataItem,
-  getPersonRecord,
+  allMockPersonRecords,
+  getMockPersonObjectMetadataItem,
 } from '~/testing/mock-data/people';
 
 describe('computeDepthOneRecordGqlFieldsFromRecord', () => {
-  const objectMetadataItem = getPersonObjectMetadataItem();
+  const objectMetadataItem = getMockPersonObjectMetadataItem();
   it('Should handle basic call', () => {
-    const personRecord = getPersonRecord();
+    const personRecord = allMockPersonRecords[0];
     const result = computeDepthOneRecordGqlFieldsFromRecord({
       objectMetadataItem,
       record: personRecord,

packages/twenty-front/src/modules/object-record/graphql/utils/__tests__/generateDepthOneRecordGqlFields.test.ts

@@ -1,8 +1,8 @@
 import { generateDepthOneRecordGqlFields } from '@/object-record/graphql/utils/generateDepthOneRecordGqlFields';
-import { getPersonObjectMetadataItem } from '~/testing/mock-data/people';
+import { getMockPersonObjectMetadataItem } from '~/testing/mock-data/people';
 
 describe('generateDepthOneRecordGqlFields', () => {
-  const objectMetadataItem = getPersonObjectMetadataItem();
+  const objectMetadataItem = getMockPersonObjectMetadataItem();
   it('Should handle basic call with standalone objectMetadataItem', () => {
     const result = generateDepthOneRecordGqlFields({
       objectMetadataItem,