ci: use flutter build bundle for dry build in generate-assets

[CharlVS]

This updates the initial dry build in .github/actions/generate-assets/action.yml to use:

• flutter build bundle [existing args]

The rest of the build remains unchanged. This avoids platform-specific build invocations during the pre-fetch/registration step while preserving all flags via sed transform.

Branch: fix/native-ci-dry-builds
Target: dev

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/native-ci-dry-builds

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[github-actions]

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