fix: avoid clipping by aggregate footer

[mdrazak2001]

fixes #9352

[greptile-apps]

PR Summary

This change increases the z-index of table cell edit mode containers to prevent popup content from being clipped by the aggregate footer row.

• Modified packages/twenty-front/src/modules/object-record/record-table/record-table-cell/components/RecordTableCellEditMode.tsx to increase z-index from 1 to 6 for StyledEditableCellEditModeContainer
• Ensures proper visibility of popups (datetime, select, relation fields etc.) when editing the last record in tables with aggregation rows

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[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5584:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5555:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5564:7)�[39m
danger-results://tmp/danger-results-8d76f333.json

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