fix(eslint-plugin): [explicit-function-return-types] fix false positive on default parameters

[kirkwaiblinger]

PR Checklist

• Addresses an existing open issue: fixes Bug: [explicit-function-return-type] false positive on defaulting parameters #8950
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

Adds default parameter check analogous to ordinary assignment.

[typescript-eslint]

Thanks for the PR, @kirkwaiblinger!

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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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[auvred]

Nice! 💯