Remove cargo run from runner (#1258)
Remove cargo run from runner (#1258)

This change:
- Removes `cargo run` from `runner`
- Copies `oak_loader` into `bin` and use it to run Oak server

Fixes #1252
project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak,project-oak/oak