Add ad-block level to advanced shield settings

[cuba]

Summary of Changes

This pull request fixes #7352

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()
• New or updated UI has been tested across:
  • Light & dark mode
  • Different size classes (iPhone, landscape, iPad)
  • Different dynamic type sizes

Test Plan:

1. Go to brave search and search for "trezor". (note it's possible the blocking rules or ads might change or may be regional)

• The ad on the top of the page should be hidden on aggressive
• The ad on the top of the page should be shown on standard

2. Go to brave search and search for "3d printer" (you need to VPN to the United States).

• Should see the shopping carrousel on standard mode
• Should not see the shopping carrousel on aggressive mode

3. Enable "Block cookie consent notices" and go to reddit. (note rules and ads sometimes change this is a somewhat uncontrolled test)

• Cookie notices should be blocked on standard and aggressive

4. Enable "Block open in app notices" and go to reddit. (note rules and ads sometimes change this is a somewhat uncontrolled test)

• Open in app notices should be blocked on standard and aggressive

5. Go to the following page: https://dev-pages.brave.software/filtering/cosmetic-filtering.html

• On aggressive mode, all images should be hidden after clicking "Run tests"
• On standard mode, only 3rd party images should be hidden after clicking "Run tests" (there is a slight unhiding delay)

6. Test any other known sites you're familiar with.
7. These changes doesn't touch at all YouTube ad blocking but just in case its worthwhile to test this.
8. Test migration. Install an older version of the app and set the default blocking to false (disabled)

• Update the app and ensure that the default is set to "Disabled"

9. Test migration. Install an older version of the app and switch between off and on for tracking and ad blocking

• Update the app and ensure that the default is set to "Standard"

10. Test default.

• Install the app from scratch and ensure that the default is set to "Standard".

11. Test site settings.

• Install from scratch and make sure the site tracking and ad blocking is on
• Change the default to "Disabled". Ensure the site tracking blocking is off
• Change the site settings to be different than the default. Change the default. Site settings are not affected.

Screenshots:

iPhone 14

Dark	Light

Tests

Aggressive	Standard

iPad

Model 1	Model 2

Ads

Standard	Aggressive

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue and pull request is assigned to a milestone (should happen at merge time).