fix(scan): 'for await' support in script setup for dev server

[trebler]

Description

Fixes issue mentioned in #2528 (comment). Specifically, when using script setup and having for await loops (non-TLA), the dev server fails to start, e.g.:

<script lang="ts" setup>
// type Subscription = AsyncIterable<{value: number}>;
const readSubscription = async (subscription: Subscription): Promise<void> => {
    for await (const { value } of subscription) {
       //
    }
};

readSubscription(subscription).catch(() => {});

> yarn dev
> html:...: error: Expected "(" but found "void"
    for void (const { value } of subscription) {

This PR removes workaround that was replacing most awaits with voids in script setup.

Additional context

The workaround introduced in 24ed098 to tackle esbuild not supporting TLA (#2044) in no longer (evanw/esbuild#253 (comment)) relevant.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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