Include pulp_file to the `generate-client` command if using a pulpcore >=`3.40.1`

[hstct]

If you one is using the current main branch of pulpcore where it includes pulp_file now by default the default command oci-env generate-client -i (which installs all clients for the projects included in the DEV_SOURCE_PATH) does not install the pulp_file clients resulting into an error if you wanna run tests.

It works if you explicitly tell it to install the pulp_file client like so: oci-env generate-client -i pulp_file

It would be great if the default command can somehow check if pulp_file clients needs to be included on its own.