fix(eslint-plugin): [no-unnecessary-condition] handle union array and tuple type

[yeonjuan]

PR Checklist

• Addresses an existing open issue: fixes Bug: [no-unnecessary-condition] false-positive for array index access optional chaining on array union type #8540
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

[typescript-eslint]

Thanks for the PR, @yeonjuan!

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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✅ Successfully ran 31 targets

• nx test eslint-plugin
• nx test eslint-plugin --coverage=false
• nx test utils
• nx run types:build
• nx test typescript-eslint
• nx test typescript-estree
• nx test visitor-keys
• nx test type-utils
• nx run repo-tools:postinstall-script
• nx test repo-tools
• nx test parser
• nx test scope-manager
• nx test rule-schema-to-typescript-types
• nx test eslint-plugin-internal
• nx test utils --coverage=false
• nx run-many --target=lint --parallel --exclude eslint-plugin
• nx test visitor-keys --coverage=false
• nx test type-utils --coverage=false
• nx test ast-spec
• nx test scope-manager --coverage=false
• nx test rule-schema-to-typescript-types --coverage=false
• nx test typescript-eslint --coverage=false
• nx test typescript-estree --coverage=false
• nx test repo-tools --coverage=false
• nx test parser --coverage=false
• nx test eslint-plugin-internal --coverage=false
• nx test ast-spec --coverage=false
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint
• nx run-many --target=typecheck --parallel
• nx run repo-tools:generate-configs
• nx run integration-tests:test

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.14%. Comparing base (3ac824b) to head (c340d40).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8592   +/-   ##
=======================================
  Coverage   87.14%   87.14%           
=======================================
  Files         251      251           
  Lines       12272    12274    +2     
  Branches     3871     3871           
=======================================
+ Hits        10694    10696    +2     
  Misses       1306     1306           
  Partials      272      272           

Flag	Coverage Δ
unittest	87.14% <100.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
...slint-plugin/src/rules/no-unnecessary-condition.ts	98.56% <100.00%> (+0.01%)	⬆️

[auvred]

🔥 LGTM!

[JoshuaKGoldberg]