fix(scan): handle local scripts with lang=ts

[bluwy]

Description

When <script setup lang="ts"> in Vue or <script lang="ts"> in Svelte is written (aka local scripts), esbuild's ts loader skips imports that looks unused. The normal scanner has a fix for it, but not for local scripts

Also adds missing tests for #5711. And added global serverLogs variable for testing.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• 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).
• Ideally, include relevant tests that fail without this PR but pass with it.

[bluwy]

Strange looks like the fix I implemented isn't actually working? 🤔 Marking as draft for now.

[bluwy]

Found a bug while adding the new test, so now this PR is a bugfix instead of a chore. Ready for review.

[patak-dev]

Great catch @bluwy!

As a note for later, maybe importsNotUsedAsValues could be used to avoid the hack? It is going to be supported from esbuild 0.14. See PR targeting vite 2.8 #5861

[bluwy]

Interesting idea! Yeah I think that could work too. We can try that when that's merge.