test(type-utils): add tests for functions in typeFlagUtils

[y-hsgw]

PR Checklist

• Addresses an existing open issue: fixes (partially) Repo: Add unit tests inside type-utils #8358
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

add Testcase in typeFlagUtils Functions.

[typescript-eslint]

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✅ Successfully ran 31 targets

• nx test scope-manager --coverage=false
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• nx test parser --coverage=false
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• nx test eslint-plugin-internal --coverage=false
• nx test ast-spec --coverage=false
• nx test eslint-plugin --coverage=false
• nx test type-utils
• nx test scope-manager
• nx test eslint-plugin
• nx test visitor-keys
• nx test typescript-eslint
• nx test repo-tools
• nx test utils
• nx test typescript-estree
• nx test rule-schema-to-typescript-types
• nx test eslint-plugin-internal
• nx test parser
• nx run-many --target=typecheck --parallel
• nx test ast-spec
• nx run integration-tests:test
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[y-hsgw]

Is the third argument 'isReceiver' in the function 'isTypeFlagSet' necessary?
Considering its usage in the callers of 'isTypeFlagSet', it doesn't seem to be utilized. Hence, I was wondering if it's safe to remove it.

[rubiesonthesky]

Small typo fixes :)