Move Confirmations into ads process

[tmancey]

Resolves brave/brave-browser#9870

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• Public documentation has been updated as necessary. 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-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

• Confirm visited http/https pages are classified
• Confirm users are rewarded for viewing ads
• Confirm confirmation is sent to the server when dismissing an ad
• Confirm confirmation is sent to the server when an ad has landed (sustained)
• Confirm confirmation is sent to the server when flagging an ad (Mark as inappropriate on ads history)
• Confirm confirmation is sent to the server when upvoting an ad (thumbs up on ads history)
• Confirm confirmation is sent to the server when downvoting an ad (thumbs down on ads history)
• Confirm brave://rewards UI is updated when rewarded for viewing an ad (also confirm same value after restarting the browser)
• Confirm brave://rewards UI is updated when viewing an ad (also confirm same value after restarting the browser)
• Confirm brave://rewards UI is updated when claiming an ads grant (also confirm same value after restarting the browser)
• Confirm "Ad notifications received this month" reset to 0 on the 1st of the month (also confirm same value after restarting the browser)
• Confirm "Next payment date" is working as expected (also confirm same value after restarting the browser)
• Confirm tokens are cashed-out periodically
• Confirm tokens are refilled when running low
• Confirm catalog is downloaded periodically
• Confirm ad conversions are working as expected
• Confirm state level targeting is working as expected
• Confirm purchase intent is working as expected

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

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.

[tmancey]

@fmarier Could you please review security_util.cc, privacy_util.cc and unblinded_tokens.cc (and anything else concerning privacy). Thanks

[fmarier]

brave_license_helper.py changes look good.

[moritzhaller]

Tested and reviewed purchase intent, ad conversions and subdivision targeting. Reviewed search providers. LGTM!

[NejcZdovc]

approving rewards code, but @tmancey before you merge it please remove base::ScopedAllowBlockingForTesting allow_blocking; for every test as we need to find another way to do it, we can't add it to every test (it was not a problem before, not sure why it's now as you removed all confirmations from rewards code). Also make sure that CI is passing before merging

[NejcZdovc]

CI failed on windows (agent was removed), everything else is green https://ci.brave.com/job/pr-brave-browser-issues-9870/33/flowGraphTable/. Restarting windows