Fix AbstractTypeAwareCheck when dealing with nested interfaces

[rnveach]

AbstractTypeAwareCheck looks like it could contain a bug when dealing with interfaces, especially nested interfaces.

When we process visitToken, we call processClass for classes, interfaces, and enumerations.
processClass manipulates currentClassName and calls processTypeParams to handle the type parameters.
When we process leaveToken for these tokens we do the same as processClass but reversing it, except we left out interfaces.

This fix just adds interface to the tokens we do this action on. Without it, we won't have correct internal variables in nested interfaces after leaving the interface.

[codecov-io]

Codecov Report

Merging #3835 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #3835   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         275     275           
  Lines       13635   13636    +1     
  Branches     3069    3070    +1     
======================================
+ Hits        13635   13636    +1

Impacted Files	Coverage Δ
...ools/checkstyle/checks/AbstractTypeAwareCheck.java	100% <100%> (ø)	✅

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[romani]

this is not a minor.
It is functional change, it might resolve few bugs :) that we already have registered but do not consider as whole functionality is deprecated but still function.

with minor prefix it will not be referenced even in release notes.

please update commit message prefix to reference this PR number and update PR description to be ready to reused in release notes.

[rnveach]

please update commit message prefix to reference this PR number and update PR description to be ready to reused in release notes.

Done.