fix(eslint-plugin): [no-confusing-void-expression] support optional chaining

[undsoft]

Fixes: #3454

[typescript-eslint]

Thanks for the PR, @undsoft!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[codecov]

Codecov Report

Merging #3937 (39f6554) into master (02c6ff3) will increase coverage by 0.81%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3937      +/-   ##
==========================================
+ Coverage   92.70%   93.51%   +0.81%     
==========================================
  Files         331      151     -180     
  Lines       11637     8145    -3492     
  Branches     3290     2583     -707     
==========================================
- Hits        10788     7617    -3171     
+ Misses        371      167     -204     
+ Partials      478      361     -117     

Flag	Coverage Δ
unittest	93.51% <100.00%> (+0.81%)	⬆️

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

Impacted Files	Coverage Δ
...t-plugin/src/rules/no-confusing-void-expression.ts	98.85% <100.00%> (+0.02%)	⬆️
packages/typescript-estree/src/ast-converter.ts
...ges/scope-manager/src/lib/es2018.asyncgenerator.ts
...e-manager/src/definition/FunctionNameDefinition.ts
packages/experimental-utils/src/ast-utils/misc.ts
...xperimental-utils/src/eslint-utils/applyDefault.ts
packages/scope-manager/src/analyze.ts
packages/scope-manager/src/lib/es2019.string.ts
...ckages/scope-manager/src/referencer/TypeVisitor.ts
...ages/scope-manager/src/referencer/ImportVisitor.ts
... and 171 more

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 39f6554. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

Status	Command
	nx test @typescript-eslint/eslint-plugin-tslint
	nx test @typescript-eslint/eslint-plugin
	nx test @typescript-eslint/eslint-plugin-tslint
	nx test @typescript-eslint/eslint-plugin
	nx test @typescript-eslint/eslint-plugin-internal
	nx test @typescript-eslint/eslint-plugin-tslint
	nx test @typescript-eslint/eslint-plugin
	nx run-many --target=typecheck --all --parallel
	nx test @typescript-eslint/parser
	nx test @typescript-eslint/experimental-utils
	nx test @typescript-eslint/scope-manager
	nx test @typescript-eslint/visitor-keys
	nx test @typescript-eslint/typescript-estree
	nx run-many --target=build --all --parallel
	nx run-many --target=build --all --parallel
	nx run-many --target=build --all --parallel
	nx test @typescript-eslint/parser
	nx test @typescript-eslint/experimental-utils
	nx test @typescript-eslint/scope-manager
	nx test @typescript-eslint/visitor-keys

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[bradzacher]

thanks for fixing this!