ci: Remove extra sample app builds from v8

[github-actions]

Note

The pull request "ci: Remove extra sample app builds from v8" was created by @noahsmartin but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

This was building both v8 and v9, we don't need to build the v8 one anymore

#skip-changelog

[linear]

COCOA-810