Allow the StreamBuilder.AsYaml to have options to disable scrubbing

TL;DR - Scrubbing control is broken as Spec.SanitiseYAML does not take the SanitiseConfig into account for scrubbing

When you want to output the result of your StreamBuilder, you can call the AsYaml function to return a scrubbed version of your configuration. This is great because it formats the configuration file in a more readable way than what we would get doing the yaml Marshalling ourselves. However, there does not seem to be a way to disable the scrubbing.

Underneath a dedicated scrubber is used (defined on config field level) to scrub the actual value in case the field contains a secret. A call to AsYaml will create a SanitiseConfig containing various options, one being to control whether scrubbing should happen or not. However, this config is not taken into account by the scrubber defined on the field.

Approach:

• Guard the scrubbing behavior in the Spec.SanitiseYAML based on SanitiseConfig.ScrubSecrets
• Make sure the NewSanitiseConfig is enabling scrubbing by default
• Allow GenerationOptions to be passed to the StreamBuilder.AsYaml() call
• Create a WithScrubbingDisabledoption to be passed to the StreamBuilder.AsYaml() call

Start with StreamBuilder.AsYaml and Spec.SanitiseYAML, then trace SanitiseConfig, NewSanitiseConfig, and GenerationOptions. Done means ScrubSecrets controls field-level scrubbing, scrubbing remains enabled by default, and AsYaml accepts a WithScrubbingDisabled option.