Clean up Rewards auto-contribute measurement

[zenparsing]

Resolves brave/brave-browser#22859
Resolves brave/brave-browser#27907
Resolves brave/brave-browser#27981

• Removes native handlers for Twitch, Vimeo, and Reddit. These handlers no longer function.
• Removes POST data listener that was only used for Twitch and Vimeo.
• Uses publisher_utils.h for all URL-to-publisher mappings.
• Uses publisher_utils.h for determining whether or not to allow tab events to measure AC.

Note: brave-ios will need to be updated as isMediaURL and reportPostData have been removed from the BraveLedger interface.

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 wiki
  • npm run lint, npm run presubmit wiki, 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:

For brave/brave-browser#27907:

• Open the browser with a fresh profile.
• Navigate to any "publisher" site.
• Open the Rewards panel and enable Rewards.
• Wait for a few seconds (in order to satisfy the "minimum publisher visit" time).
• Navigate to a new URL.
  • Note: navigating away from the previous site is required, as the AC time is not measured until the tab is closed, hidden, or navigated.
• Open the Rewards panel.
• Verify that the "publishers visited" count is displayed with a value of 1.

[github-actions]

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[github-actions]

⚠️ PR head is an unsigned commit
commit: 5a376ccf7beceb98523847e3dcbc1d8261636a3f
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Please follow the handbook to configure commit signing
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[github-actions]

⚠️ PR head is an unsigned commit
commit: 5a376ccf7beceb98523847e3dcbc1d8261636a3f
reason: unsigned
Please follow the handbook to configure commit signing
cc: @zenparsing

[github-actions]

⚠️ PR head is an unsigned commit
commit: 5a376ccf7beceb98523847e3dcbc1d8261636a3f
reason: unsigned
Please follow the handbook to configure commit signing
cc: @zenparsing

[github-actions]

⚠️ PR head is an unsigned commit
commit: 618f6688a4d7fa5301fed3d7d1d9656bcd1359f5
reason: unsigned
Please follow the handbook to configure commit signing
cc: @zenparsing

[emerick]

LGTM