next-image: fix deployment id handling for unoptimized (#90416)
Previously
```jsx
import img from "./x.png";
// x is "/_next/static/media/test.abc123.png?dpl=foo"
<Image id="static-unoptimized" src={x} unoptimized />
```
would lead to `/_next/static/media/test.abc123.png?dpl=foo&dpl=foo`
#90420 adds some related tests for the legacy loader as well
