Make successful reset of Rewards data also reset onboarding state

[emerick]

Resolves brave/brave-browser#22003

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

• Clean profile
• Enable Rewards
• Visit brave://rewards
• Reset Rewards via "Manage Brave Rewards" button
• Ensure that onboarding overlay displays on brave://rewards
• Ensure that onboarding overlay displays on Rewards panel

[brave-builds]

A Storybook has been deployed to preview UI for the latest push

[szilardszaloki]

Shouldn't we make this change to components/brave_rewards/resources/android_page/reducers/rewards_reducer.ts as well?

[emerick]

I did have it in there initially, but there's no onboarding overlay on the Android settings page. Maybe I should add it to the reducer anyway for consistency though? WDYT?

[szilardszaloki]

Yeah, I'd probably still add it.

[emerick]

Yep, agreed. I added that in and a couple of missing onboarding-related case statements to bring the android page in line with the desktop page.

[brave-builds]

A Storybook has been deployed to preview UI for the latest push

[emerick]

CI passed; SonarCloud analysis failed with expected error for android pages.