[Docker] Add terms and conditions app to chip-cert-bins image (project-chip#37474)

Add the terms and conditions application binary to the chip-cert-bins Docker
image build for both x64 and arm64 architectures. This change includes:

- Adding build target for terms-and-conditions app
- Copying the built binary to the final image
- Adding environment variable reference in CI test configuration

This addition will support upcoming CI test requirements for the terms and
conditions functionality.

Author: swan-amazon