VSCode serialization changed rejection handling to only serialize errors, which caused things to break
- Changed to return either account info or a cancel message in the resolve
- Rewrote to use promises. Tracking how to return canceled through 4+ thenables was way trickier than just using a promise
- Updated unit tests to handle new scenario
- Tested integration tests, realized they a) didn't run and b) didn't passed.
- Added vscode dev dependency to fix run issue
- Fixed tests to account for behavior changes in tree state.
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