[EngSys] Opt outs for faster package iteration

@ahsonkhan encountered a couple issues onboarding an appconfig package. Enabling opt-outs here would keep forward momentum:

1. Allow a service to opt out of [restoring test recordings](https://github.com/Azure/azure-sdk-for-cpp/blob/main/eng/pipelines/templates/jobs/ci.tests.yml#L219) ... this is already present in YAML but should be pushed into `ci.yml` instead of buried in the templates
2. Allow package artifacts to opt out of docs builds (something we have in other languages but not in C++)

Relevant pipeline runs: https://dev.azure.com/azure-sdk/public/_build/results?buildId=4303277&view=logs&j=a7bbfb1e-9b1d-5480-b954-b42b4949e5ba&t=096ff1de-ad77-5a07-f98a-aae88a25dd53