* fix: Modify 'load' behavior to append data to existing sheet
Details:
- Added logic to detect existing sheet and append data if present.
- There is no direct way to append on the sheet, so I am reading the sheet to get the last row number and then writing after that row number.
Resolves: #5472
* Fixed 'worksheet not found' error during export to an existing sheet
* Changes:
* Now if the sheet exists in the xlsx file it will ask the user if he
wants to replace/append/create new sheet
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Co-authored-by: Danglewood <85772166+deeleeramone@users.noreply.github.com>