fix: upload only known build output directories

[vaind]

📜 Description

• change build dir default value
• add symbols path config
• enumarate known build dir paths
• update tests to test all possible targets of flutter build

💡 Motivation and Context

fixes #270

💚 How did you test it?

📝 Checklist

• depends on test: move integration tests to dart #279
• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps