Remove all genproto.sh files

[mic-max]

This change is towards the goal of moving the generation of the generated protobuf files to the Dockerfile and not checking them into the repository.

These files are not used by anything.

Changes

Remove all genproto.sh files

[julianocosta89]

LGTM and I have only one note (not a blocker).
Removing the genproto.sh files will not impact the services, but it may impact on ppl trying to build/compile the project locally.
Hence, it would be good to have a README, explaining how to compile the proto files per service.
Something like @mic-max have done in this PR already: https://github.com/open-telemetry/opentelemetry-demo-webstore/blob/300001bb6f895bffca5910eccaa7569285308f8e/src/recommendationservice/README.md

[mic-max]

By build/compile the project locally I guess you also mean without using docker, right? for example, they run go build and it complains about the missing files

In follow-up PRs we could include this instruction in the service READMEs like you linked the example where I did so 👍