[DDW-582] Improve transaction error message for rewards only wallets

[nikolaglumac]

This PR improves the error message shown when attempting to create a transaction from a wallet that contains rewards only balance.

Text copy: https://docs.google.com/document/d/19tEZsvoQDEFlkmDgAX4oaVnjsyyLoooMrYMDiF8sx4k/edit

Screenshots

---

Testing Checklist

• Slack QA thread
• Test sending transaction from both software and hardware wallets while having only rewards and no UTXOs

Test Cases

Scenario 1: Transaction with reward only wallet
Given I have a wallet with only reward
When I attempt to do transaction
Then I will observe the following error:
Your wallet contains only reward funds.
Please send at least one ADA to your wallet so
that you can spend the funds

---

Review Checklist

Basics

• PR has been assigned and has appropriate labels (feature/bug/chore, release-x.x.x)
• PR is updated to the most recent version of the target branch (and there are no conflicts)
• PR has a good description that summarizes all changes
• PR has default-sized Daedalus window screenshots or animated GIFs of important UI changes:
  • In English
  • In Japanese
• CHANGELOG entry has been added to the top of the appropriate section (Features, Fixes, Chores) and is linked to the correct PR on GitHub
• Automated tests: All acceptance and unit tests are passing (yarn test)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in development build (yarn dev)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in production build (yarn package / CI builds)
• There are no flow errors or warnings (yarn flow:test)
• There are no lint errors or warnings (yarn lint)
• There are no prettier errors or warnings (yarn prettier:check)
• There are no missing translations (running yarn manage:translations produces no changes)
• Text changes are proofread and approved (Jane Wild / Amy Reeve)
• Japanese text changes are proofread and approved (Junko Oda)
• UI changes look good in all themes (Alexander Rukin)
• Storybook works and no stories are broken (yarn storybook)
• In case of dependency changes yarn.lock file is updated

Code Quality

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

Testing

• New feature/change is covered by acceptance tests
• New feature/change is manually tested and approved by QA team
• 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 the PR
• Delete the source branch
• Move the ticket to done column on the YouTrack board
• Update Slack QA thread by marking it with a green checkmark

[tomislavhoracek]

@nikolaglumac Amazing !!! 💯 💪

[miorsufianiohk]

Looks good on 17086. Great work @nikolaglumac 👍

[ManusMcCole]

👍