Fix conan shared builds and conan CI RSDK-9113

[lia-viam]

It turns out shared library builds have been broken all along with conan and I did not realize because the test_package was not meaningfully testing the library, but then I further did not realize because the cron + new commits dispatch for the conan job was broken. This PR

• fixes shared builds
• changes the CI trigger for the conan job

[jckras]

Just trying to gather context for my own understanding:

• How are shared libraries being used in cpp-sdk? does the shared-ness refer to whether libraries are being compiled as shared or static?
• what do you mean by the "shared-ness of grpc and protobuf needs to match our shared-ness"... the way we compile gRPC and protobuf libraries must be the same as the way we compile our project?

[lia-viam]

@jckras

* How are shared libraries being used in cpp-sdk? does the shared-ness refer to whether libraries are being compiled as shared or static?

Exactly!

* what do you mean by the "shared-ness of grpc and protobuf needs to match our shared-ness"... the way we compile gRPC and protobuf libraries must be the same as the way we compile our project?

That part is a bit vague and Drew suggested elaborating on it as well but yes, we need a shared grpc/proto for a shared SDK build and vice versa, going to update that comment and also elaborate on it

[lia-viam]

Just sharing this for reference/discussion:
conan-io/conan-center-index#23421

addressed