feat: record group insert at bottom when created

[magrinj]

Fix #9050

When we add a new record in a record group this one should be added at them bottom.

[greptile-apps]

PR Summary

This PR modifies record insertion behavior in record groups to add new records at the bottom of the visible page instead of the top, addressing issue #9050.

• Modified position calculation in useUpsertTableRecordInGroup.ts to place new records after the last record with a +0.0001 position increment
• Reordered components in RecordTableRecordGroupRows.tsx to place RecordTablePendingRecordGroupRow before load more section
• Added support for 'first', 'last', and numeric positioning in triggerCreateRecordsOptimisticEffect.ts for flexible record insertion
• Removed pending record check in RecordTableRecordGroupSectionAddNew.tsx to allow consecutive record additions
• Fixed syntax error in graphql-query-create-one-resolver.service.ts by removing erroneous 'async;' line

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[charlesBochet]

@magrinj tested your PR, looks better and better!

Found a bug: if I have many pages, I add a record and then click on load more, my record is present twice

which makes sense! We should either:

• update the cursor (containing the sorts + position) to take care of the new last position
• update our pagination concatenation to remove duplicates (might be easier and more robust)