Fix #8731: Fix issue with standard mode content blockers with large list

[cuba]

Summary of Changes

This pull request fixes #8731 Also removing a bunch of dead code that just complicates things in fixing this and creates more memory usage during compile.

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:

There is no way to reproduce this issue with the current list of rule lists available. Instead we want to test that large lists work as intended:

1. Add the following custom rule list: https://gist.githubusercontent.com/cuba/f13fce20b8fbd043ac8174e39ba16788/raw/66efa96fd188e2d155e17f5b663b9a2f6e918e7e/TestAdBlockRules.txt
2. Wait a little bit for it to download and compile (1 minute) as it is quite a large list
3. Go to brave.com
4. Brave Logo should be blocked

Screenshots:

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).