Add custom conversion ID patterns for Verifiable Advertiser Conversions

[moritzhaller]

Resolves brave/brave-browser#15491

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
• 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:

VAC - DOM

• Mock catalog_dom.json for catalog
• Set up mock conversion page on localhost. This page has to match the key in the resource (see step 2).
• Start browser on fresh profile with ads enabled. Wait for ads resources components to download and quit.
• Once downloaded, add mock resource for custom VAC scripts (see vendor/bat-native-ads/data/test/resources/nnqccijfhvzwyrxpxwjrpmynaiazctqb) and add to resources.json.
• Start browser again and make sure the resource got initialised with conversions_resource.cc(36)] Successfully loaded ...
• Trigger an ad notification (set up catalog such that ad with VAC conversion triggers).
• Go to conversion page (https://brave.com/careers/) and trigger a conversion, which now should extract the custom ID according to the regex pattern in the resource.
• Verify that conversion ID was extracted by looking up the value in the DB (conversion queue table).

Conversion ID: foo-12345

VAC - URL

• Mock catalog_url.json for catalog
• Set up mock conversion page on localhost. This page has to match the key in the resource (see step 2).
• Start browser on fresh profile with ads enabled. Wait for ads resources components to download and quit.
• Once downloaded, add mock resource for custom VAC scripts (see vendor/bat-native-ads/data/test/resources/nnqccijfhvzwyrxpxwjrpmynaiazctqb) and add to resources.json.
• Start browser again and make sure the resource got initialised with conversions_resource.cc(36)] Successfully loaded ...
• Trigger an ad notification (set up catalog such that ad with VAC conversion triggers).
• Go to conversion page (https://www.nytimes.com/section/world?conversion_id=baz-987-xyz) and trigger a conversion, which now should extract the custom ID according to the regex pattern in the resource.
• Verify that conversion ID was extracted by looking up the value in the DB (conversion queue table).

Conversion ID: baz-987-xyz

VAC files.zip

[tmancey]

nit: newline at end of file, otherwise github complains, see above

[tmancey]

nit: 2U

[tmancey]

LGTM++