fix(eslint-plugin): [no-unsafe-return] handle union types

[yeonjuan]

PR Checklist

• Addresses an existing open issue: fixes Bug: [no-unsafe-return] any to any callback is not allowed when cb is union type #8982
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

Change it to handle union types using tsutils.getCallSignaturesOfType.

[typescript-eslint]

Thanks for the PR, @yeonjuan!

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✅ Successfully ran 31 targets

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

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[kirkwaiblinger]

Very nice! Short and sweet!

[auvred]

Very neat!