[mdatagen] Validate context propagation on processors and connectors

[mx-psi]

Component(s)

cmd/mdatagen

Describe the issue you're reporting

Most processors and connectors should propagate context. Since we completed #13039, we can easily test for this by introducing a key with a random value in the context and checking that the key-value pair is recoverable by the next consumer.

We should test this for all signals/signal type combinations. We should have a mechanism to opt out of this autogenerated tests if the component in question does not propagate context

[github-actions]

Pinging code owners:

• cmd/mdatagen: @dmitryax

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[samuelarogbonlo]

I am working on this, I hope it can be assigned to me @mx-psi