set `upload_sourcemaps` to true by default

[denrase]

:scroll: Description

set upload_sourcemaps to true by default

:bulb: Motivation and Context

Closes #311

:green_heart: How did you test it?

Updated unit tests.

:pencil: Checklist

• [x] I reviewed submitted code
• [x] I added tests to verify changes
• [ ] I updated the docs if needed
• [x] All tests passing
• [x] No breaking changes

:crystal_ball: Next steps

[buenaflor]

@denrase I'm not sure if we can release this in a non-major, let's talk about this in the sync

[buenaflor]

It's not important for now, let's revisit it some time when it's important