447: Remove Lifetimes from Push Constants r=kvark a=cwfitzgerald
This is sound because for render passes, compute passes, and render bundles we immediately copy the data into an internal buffer then refer to the data by offset into the buffer.
This also cleans up the example a bit as we don't need the array to outlive the statement.
Co-authored-by: Connor Fitzgerald <connorwadefitzgerald@gmail.com>