chore: remove form-data dependency

[benmccann]

This uses the standard built-in class for FormData vs an external package. It will also let us remove axios as a dependency in a follow-up (#6647).

[jrasm91]

Does this still stream the file from disk? Also, ever since the CLI was converted to esm it no longer works. TSC doesn't modify the import paths and esm requires extensions. Can we use vite to bundle the CLI to fix this?

[benmccann]

Good call outs. Let me check into these.

How about if we add the file extensions rather than bundling? I can update the tsconfig to fail the build if the file extensions are missing

[benmccann]

Although maybe bundling is better as it will result in a smaller distributable. I'm not quite sure how the CLI is distributed currently

[jrasm91]

Good call outs. Let me check into these.

How about if we add the file extensions rather than bundling? I can update the tsconfig to fail the build if the file extensions are missing

I already looked into this, but the generated typescript-sdk is typescript files, which don't have extensions in the imports, so I'm not sure how to address the issue in that code. The rest of it was easy enough to change.

[benmccann]

Does this still stream the file from disk?

It seems we are very lucky to have to support only Node 20, which makes life here vastly easier. This PR uses openAsBlob which should allow for streaming the data: nodejs/undici#2202 (comment). We do wrap the result of that in new File, so I don't know if we'd need to remove that or not. If it's not streaming, it seems like it'd probably be a small change to make it do so. I could probably use some help in testing whether it does stream or not