Resolve rewards icon issue

[deeppandya]

Resolves brave/brave-browser#20633
Resolves brave/brave-browser#20646

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:

[SergeyZhukovsky]

++

[kjozwiak]

Verification PASSED on Pixel 6 running Android 12 using 1.37.57 Chromium: 98.0.4758.102

Test Case 1 - brave/brave-browser#20633

• ensured that you can hide/display the rewards icon when rewards/ads hasn't been enabled yet
• ensured that you can hide/display the rewards icon when rewards is being used/enabled
• ensured that user state/data isn't being lost when disabling the icon and rewards has been enabled

Test Case 2 - brave/brave-browser#20633

Rewards Enabled/Rewards Icon Visible - PASSED

• installed 1.36.54 Chromium: 97.0.4692.99 as per Rewards button is not shown upon upgrade brave-browser#20646 (comment)
• enabled rewards and viewed a few ads/populated the a-c table
• upgraded to 1.37.57 Chromium: 98.0.4758.102 and ensure that the rewards icon is still visible/working as expected
• ensure that the data generated within rewards is retained

Rewards Enabled/Rewards Icon Hidden - FAILED

Ran into rewards icon made visible after upgrading after user has disabled it via Appearance settings #21183 - brave/brave-browser#21183. Rewards icon keeps re-appearing and not staying disabled.

Rewards Disabled/Rewards Icon Visible - PASSED

• installed 1.36.54 Chromium: 97.0.4692.99 as per Rewards button is not shown upon upgrade brave-browser#20646 (comment)
• upgraded to 1.37.57 Chromium: 98.0.4758.102 without enabling rewards and ensured that the rewards icon is still visible

Rewards Disabled/Rewards Icon Hidden- FAILED

Ran into rewards icon made visible after upgrading after user has disabled it via Appearance settings #21183 - brave/brave-browser#21183. Rewards icon keeps re-appearing and not staying disabled.