feat: Resolve `getAncestors` and `getScope` calls in eslint v9

[scagood]

What is the purpose of this pull request? This is phase 1 of getting eslint v9 working.

The features this implements are:

1. Use the sourceCode form of getAncestors
2. Use the sourceCode form of getScope
3. Allow for the RuleTester class to be usable in both eslint v7, v8 and v9.

---

As you may be able to tell, I copied a few files over from eslint-plugin-n (Specifically from https://github.com/eslint-community/eslint-plugin-n/pull/161) (@aladdin-add Thank you for the prior art 🙏)

---

This is one part of #449.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (bbcfcbf) to head (1147fe2). Report is 6 commits behind head on main.

:exclamation: Current head 1147fe2 differs from pull request most recent head 9a9eec3

Please upload reports for the commit 9a9eec3 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #466   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           25        24    -1     
  Lines          649       656    +7     
  Branches       250       250           
=========================================
+ Hits           649       656    +7     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[scagood]

ESLint v9 is not actually fixed in this PR :eyes:

I want to do this lovely little deprecation in a different PR.

(node:1888) DeprecationWarning: "no-multiple-resolved" rule uses CodePath#currentSegments and will stop working in ESLint v9. Please read the documentation for how to update your code: https://eslint.org/docs/latest/extend/code-path-analysis#usage-examples