Fix field empty value check for Person standard object

[charlesBochet]

The previous code was not correct if labelIdentifier is a FULL_NAME.
We already have an util for this

Fixes: #10532

[greptile-apps]

PR Summary

This PR fixes field empty value checks for the Person standard object when the labelIdentifier is a FULL_NAME field by leveraging existing utilities instead of custom logic.

• Moved components and hooks from record-picker-morph-legacy to activities/inline-cell directory for better organization
• Added new ActivityTargetInlineCellEditModeMultiRecordsSearchFilterEffect component to handle filtering records for activity targets
• Added required componentInstanceId prop to MultipleRecordPicker and related components for proper state management
• Added onOpenEditMode and onCloseEditMode callbacks to FieldContext and RecordInlineCellContext to handle edit mode transitions
• Created dedicated MultiObjectRecordQueryResult type file to separate types from implementation

Greptile AI: This PR fixes field empty value checks for the Person standard object when the labelIdentifier is a FULL_NAME field by leveraging existing utilities instead of custom logic.

• Moved components and hooks from record-picker-morph-legacy to activities/inline-cell directory for better organization
• Added new ActivityTargetInlineCellEditModeMultiRecordsSearchFilterEffect component to handle filtering records for activity targets
• Added required componentInstanceId prop to MultipleRecordPicker and related components for proper state management
• Added onOpenEditMode and onCloseEditMode callbacks to FieldContext and RecordInlineCellContext to handle edit mode transitions
• Created dedicated MultiObjectRecordQueryResult type file to separate types from implementation

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