fix(uv): Propagate sdist build failures

[arrdem]

Need to use check_call so that sdist builds properly fail if the called build operation fails. Hopefully we can remove this whole wrapper shortly for uv build.

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: yes

Failed sdist builds under the UV extension now correctly fail the build chain.

Test plan

• Manual testing