Add missing prefix to source file upload

[denrase]

📜 Description

The source maps reference sources from the root folder. So when we added lib as a folder for sources to upload, we also need to add lib as a prefix so the reference is correct.

💡 Motivation and Context

Closes #299
Closes #304

💚 How did you test it?

Updated unit test.

📝 Checklist

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

[buenaflor]

do you know what happens for packages relying on other packages?

e.g I have a main app that consumes internal modules A and B

I guess this would only cover uploading and prefixing files correctly for main app so frames coming from module A and B would not have source context?

[denrase]

As long as the modules are within the lib folder, it "should" be fine. If they are outside, we are not supporting this currently, as we intentionally moved away from scanning the whole folder.

[buenaflor]

I guess that can be a usecase though right? when they have internal libraries that they consume for example. we don't have to support it now but I guess we can create an issue and see if people are interested

[buenaflor]

looks good 👍 we should also think about writing proper end-to-end tests for this in the future

[denrase]

@buenaflor Put this in draft as i want to test more scenarios when we get feedback.

[buenaflor]

change looks good to me

[github-actions]

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- Add missing prefix to source file upload ([#306](https://github.com/getsentry/sentry-dart-plugin/pull/306))

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