[v9] Stop using prepack script in Deno SDK and rely on `build/X` path instead

[AbhiPrasad]

Description

sentry-javascript/packages/deno/scripts/prepack.js

Line 9 in 5b77377

* TODO(v9): Remove this script and change the Deno SDK to import from build/X.

[lforst]

@AbhiPrasad I struggled to understand how this is breaking which is why wouldn't have put it into v9. Can you explain?

[AbhiPrasad]

See #12698 as some context about why removing the prepack script was breaking.