fix: Multiple fileInputs in a repeatingSet

[dsamojlenko]

Summary | Résumé

Fixes multiple fileInputs in a repeatingSet.

Previously, if you attempted to attach more than one file in a repeatingSet you would see the following error in the console and the form submit would fail:

Additionally, through testing it appears we'll need to set the maximum total file size lower to accommodate payload limits when sending to Notify. Dropped the overall bodySizeLimit for serverActions to 5MB, meaning the file size limit is actually about 4MB.

Test instructions

• Create a form with a fileInput in a repeatingSet. ie: multiple-file-uploads-2024-08-12.json
• Configure the form to send by email.
• Test the form in Preview and attach more than one file in the repeatingSet.

[github-actions]

🧪 Review environment

https://7y4fhanloyl5llyhznpxlujqki0pyyxw.lambda-url.ca-central-1.on.aws/

[thiessenp-cds]

Unrelated to this PR, I think this code could really help readability if it were refactored. Especially the deep nesting, including nested try-catches.

[thiessenp-cds]

I tested in the Preview mode and forms-form mode with files under and over the combined 5MB limit, works as expected. This code also looks pretty isolated so a full app test probably isn't necessary (beyond the happy paths)
Nice work, LGTM :)