fix(core/shell): speedup Command.execute & fix extra new lines (#1299)

* fix(core/shell): speedup `Command.execute` & fix extra new lines

The speed gains comes from running the Command in Rust fully and returning the result in one go instead of using events.

The extra new lines was a regression from https://github.com/tauri-apps/tauri/pull/6519
ref: https://github.com/tauri-apps/tauri/issues/7684#issuecomment-2100897383

* fmt

* dedup code

plugins/shell/api-iife.js

@@ -1 +1 @@
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