Fix last batch of jest tests

[thomtrp]

As title

[greptile-apps]

PR Summary

The pull request focuses on simplifying test setups by removing unnecessary mocks and providers, adding RecoilRoot wrappers, and enhancing test cases for better coverage and reliability.

• /packages/twenty-front/src/modules/activities/hooks/__tests__/useActivities.test.tsx: Simplified test setup by replacing GraphQL query mocks with Jest mocks for useActivityTargetsForTargetableObjects and useFindManyRecords.
• /packages/twenty-front/src/modules/activities/timelineActivities/hooks/__tests__/useTimelineActivities.test.tsx: Added RecoilRoot wrapper to ensure proper Recoil context during testing.
• /packages/twenty-front/src/modules/activities/timelineActivities/utils/__tests__/filterOutInvalidTimelineActivities.test.ts: Enhanced test cases to cover scenarios with multiple metadata items and validate filtering logic.
• /packages/twenty-front/src/modules/activities/timelineActivities/utils/filterOutInvalidTimelineActivities.ts: Added a comment clarifying shared field metadata for Note and Task objects.
• /packages/twenty-front/src/modules/object-record/relation-picker/hooks/__tests__/useMultiObjectSearch.test.tsx: Removed Apollo Client's MockedProvider and RecoilRoot, directly mocking custom hooks used within useMultiObjectSearch.

_{5 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings}