Parse iOS Assets.car into per-asset images

[sentry-junior]

build upload currently skips iOS Assets.car asset-catalog parsing, so the server only sees the raw .car instead of a per-image breakdown. That gap is called out as a ship-blocker for preprod size analysis.

Current behavior

• Docs in packages/cli/src/commands/build/upload.ts state: "iOS Assets.car asset catalogs are not parsed into per-asset images."
• Commit 591f1bba intentionally diverged from the legacy Rust CLI: it skipped .car parsing (which used native macOS CoreUI / apple_catalog_parsing) so iOS upload could ship on all platforms without an Apple Silicon gate.
• Legacy sentry-cli gated iOS upload to Apple Silicon because that CoreUI path required it; customers typically build + upload from macOS CI runners.

Gap

• Without per-asset catalog expansion, preprod size analysis cannot break down iOS asset catalogs the way the legacy path did.

Raised by Trevor Elkins.

Requested by bete.

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