Show Header in RecordTable on empty state and show groups in Group By views

[Harshit-RV]

Closes #11298

[greptile-apps]

PR Summary

The changes update the empty state rendering in the record table to ensure the header (Fields bar) is always visible when the table is empty and to display the grouped view properly when grouping is applied.

• Updated conditional rendering in /packages/twenty-front/src/modules/object-record/record-table/components/RecordTable.tsx to differentiate between default and grouped empty states.
• Ensured that the RecordTableHeader remains rendered during an empty state.
• Incorporated checks for grouped views using RecordTableRecordGroupBodyEffects and RecordTableRecordGroupsBody while managing nested ternary readability.

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[FelixMalfait]

Thank you! Could you please check the group by view type?

[Harshit-RV]

Fixed it. @FelixMalfait

[Harshit-RV]

@FelixMalfait Let me know if any further changes are needed

[FelixMalfait]

Hey @Harshit-RV thanks! I took over because the header wasn't displayed properly (missing StyledTable wrapper). Also I thought it'd be nice to disable checkboxes in that case. My update isn't perfect because the header isn't sticky, but that would require a refactoring which is not worth it imo.

[FelixMalfait]

Thank you!