Fix activity target picker

[charlesBochet]

This PR is fixing the Task/Note Target picker.

Issue

A few weeks ago, we have simplified the recordPicker logic. During this refacto, we stopped making sure the selected records were fetched.
However, the optimistic update of the activity supposed that current activityTargets are present in the selection in the picker in order to filter out the removed items.

Fix

In case we don't find the record in the picker selection, we don't filter it out (it means the user cannot have removed it)

Next step

@ijreilly I think we should put it back, as the selected records do not appear on top anymore

[greptile-apps]

PR Summary

This PR fixes a bug in the activity target picker where activity targets were being incorrectly filtered out during updates due to incomplete record fetching.

• Modified filtering logic in /packages/twenty-front/src/modules/activities/inline-cell/components/ActivityTargetInlineCellEditMode.tsx to preserve activity targets not found in selection
• Fixed optimistic update behavior to prevent accidental removal of valid activity targets
• Ensures backward compatibility with existing activity target data by maintaining unfetched records

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[greptile-apps]

style: This ternary could be simplified to return !recordSelectedInMultiSelect || recordSelectedInMultiSelect.selected

[Weiko]

LGTM