fix(esbuild): transpile with esnext in dev

[bluwy]

Description

Fix #10167

In dev transpiling ts/tsx (etc) and vue (with lang="ts"), set esbuild target to esnext to prevent syntax lowering. This should only affect dev, as build runs another round of transpile based on build.target.

Additional context

Thanks @sapphi-red for digging into this.

Given that this used to work in the past, I think this isn't a breaking change.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

@bluwy would you also backport to the v3.1 branch? I think it would be good to fix it there too.