feat: warn if ? in project root

[steadily-worked]

Description

Fix #15726

Additional context

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since both # and ? are targets for remaining, i use forEach.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines, especially the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Update the corresponding documentation if needed.
• Ideally, include relevant tests that fail without this PR but pass with it.

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[steadily-worked]

It seems that I overlooked the fact that the warning appears unnecessarily twice when both # and ? are included. There is already a separate PR(even testing included) addressing this case(#15761), so I will close this one.