(fix) O3-3627: Preserve original filename when saving an attachment

[suubi-joshua]

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• This PR has a title that briefly describes the work done including the ticket number. Ensure your PR title includes a conventional commit label (such as feat, fix, or chore, among others). See existing PR titles for inspiration.

For changes to apps

• My work conforms to the O3 Styleguide and design documentation.

If applicable

• My work includes tests or is validated by existing tests.
• I have updated the esm-framework mock to reflect any API changes I have made.

Summary

This PR amends the logic that uploads a file to the server, ensuring that when a File object is provided, the original filename is saved. Presently, if the user manually edits the filename, the existing logic will save the original filename from the File object (typically the user's selection from the file dialog). This change makes it so that the filename is saved as the user edits it, rather than the original filename.

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Related Issue

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[suubi-joshua]

@denniskigen Still trying to figure out how to hide the type extension from the user.
Before
Screencast from 21-10-24 15:23:04.webm

After
Screencast from 21-10-24 03:04:12.webm

[denniskigen]

Thanks, @suubi-joshua!

[denniskigen]

I've tested this out and found that it works as expected, i.e. the provided filename is preserved after saving the file @dkayiwa, @ibacher. Any qualms with the approach?