Excel Conversion Update - Filewatcher Standard

Title of ticket:

#### Description
We need to update our file conversion logic for excels, to mirror what is currently happening with filewatcher. It was observed that excels with a larger number of columns are not converting as nicely as our filewatcher logic can handle. In addition - excels with multiple tabs are not actioning the other tabs.

#### Dependencies
Are there any dependencies?

#### DOD
- [ ] Update file conversion logic to handle excels with multiple tabs
- [ ] Update file conversion logic to handle excels with many columns (fit to page)

Start by locating the file conversion logic and the existing filewatcher implementation that handles Excel files. Compare their treatment of multiple tabs and wide sheets, then verify that all tabs are converted and wide sheets use fit-to-page behavior.

Written by the indexing model from the issue text.