[DDW-231] log expected errors as debug messages only

[DominikGuzei]

This PR improves our error handling by logging expected error cases only as debug messages instead of spamming our dev console.

Review Checklist:

Basics

• PR is updated to the most recent version of target branch (and there are no conflicts)
• PR has good description that summarizes all changes and shows some screenshots or animated GIFs of important UI changes
• CHANGELOG entry has been added and is linked to the correct PR on GitHub
• Automated tests: All acceptance tests are passing (npm run test)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in development build (npm run dev)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in production build (npm run package / CI builds)
• There are no flow errors or warnings (npm run flow-test)
• There are no lint errors or warnings (npm run lint)
• Text changes are proofread and approved (Jane Wild)
• There are no missing translations (running npm run manage-translations produces no changes)
• UI changes look good in all themes (Alexander Rukin)
• Storybook works and no stories are broken (npm run storybook)
• In case of npm dependency changes both package-lock.json and yarn.lock files are updated

Code Quality

• Important parts of the code are properly documented and commented
• Code is properly typed with flow
• React components are split-up enough to avoid unnecessary re-rendering
• Any code that only works in Electron is neatly separated from components

Testing

• New feature / change is covered by acceptance tests
• All existing acceptance tests are still up-to-date
• New feature / change is covered by Daedalus Testing scenario
• All existing Daedalus Testing scenarios are still up-to-date

After Review:

• Merge PR
• Delete source branch
• Move ticket to done on the Youtrack board

[nikolaglumac]

Nice work @DominikGuzei!

There are a few things I would like to change:
1). Perhaps we should log handled errors with the Logger.debug and unhandled/unexpected ones with Logger.error same as it is done here: https://github.com/input-output-hk/daedalus/blob/develop/source/renderer/app/api/ada/index.js#L631-L635 - I believe that would be the proper way to go!
2). I think we should apply the same logic to ETC Api too.
3). Please add CHANGELOG entry.
Thanks for making these changes!

[DominikGuzei]

@nikolaglumac i agree that it would be "better" … unfortunately it's not easily possible without a lot of duplicated logging statements or boilerplate around it. Basically I would have to duplicate the error logging into any if statement or set a flag like isHandledError for each case.

[nikolaglumac]

@DominikGuzei roger that!
Let's leave 1). for later. What about 2). and 3).? :)

[DominikGuzei]

working on those now @nikolaglumac 👍

[DominikGuzei]

@nikolaglumac changelog and ETC updates are added!

[nikolaglumac]

Looks good now! Approved @DominikGuzei