fix(eslint-plugin): [no-unnecessary-qualifier] handle nested namespace id

[yeonjuan]

PR Checklist

• Addresses an existing open issue: fixes Bug: [no-unnecessary-qualifier] false positive for nested namespace #7192
• 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 19 targets

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

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[JoshuaKGoldberg]

💯, thanks!

Build failures are unrelated. This PR is perfect as-is.