[Applab Datasets] Fix off-by-one error in upload scripts

[ajpal]

Description

ids for the purpose of the Data Tab are 1-indexed. I had set the id on each record correctly, but put them all in an array (0-indexed) and set them in firebase that way. As a result, the id on each record, did not match the id of the firebase node. This resulted in off-by-one errors when trying to edit or delete records
Before:

After:

Testing story

Reviewer Checklist:

• Tests provide adequate coverage
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked

[epeach]

LGTM.