To avoid problems like #14633 in the future, we can recursively get all the direct, indirect, and test dependencies for codersdk to ensure they don't include anything that requires one of our go.mod replace directives.

We could also maintain a list of 'heavy' dependencies and include that in the script, but the replace directives already include tailscale (and therefore gvisor).

e.g. when coderdtest is imported in codersdk_test locally:

~/coder $ ./scripts/check_codersdk_imports.sh
ERROR: codersdk cannot import the following packages being replaced in go.mod:
github.com/alecthomas/chroma/v2
go.opencensus.io
github.com/tcnksm/go-httpstat
github.com/dlclark/regexp2
tailscale.com
github.com/gliderlabs/ssh
github.com/pkg/sftp
github.com/lib/pq

otherwise:

~/coder $ ./scripts/check_codersdk_imports.sh
codersdk imports OK