fix(cli-utils): Fix `undefined` symbol crash and output bug in `turbo` command

[kitten]

Set of changes

• Fix crash when returnType.symbol is undefined
• Fix output logging all file names when warnings have been discovered in other files

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2688e257ef704f23d35c5b1217ae0a89868a709a

The changes in this PR will be included in the next version bump.

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