fix(scope-manager): correctly handle inferred types in nested type scopes

[bradzacher]

Fixes #2459

This was a bit tricky. Nested scopes are wack.

[typescript-eslint]

Thanks for the PR, @bradzacher!

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[codecov]

Codecov Report

Merging #2497 into master will decrease coverage by 0.00%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master    #2497      +/-   ##
==========================================
- Coverage   92.83%   92.82%   -0.01%     
==========================================
  Files         290      290              
  Lines        9377     9393      +16     
  Branches     2626     2631       +5     
==========================================
+ Hits         8705     8719      +14     
- Misses        321      322       +1     
- Partials      351      352       +1     

Flag	Coverage Δ
#unittest	92.82% <87.50%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ckages/scope-manager/src/referencer/TypeVisitor.ts	89.01% <87.50%> (-0.33%)	⬇️