Fix: use bidder info fs config as base when merging overrides #3289
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This is one way we can fix the bidder info config override logic issue where information in the base config (file system) is lost when override data is provided (pbs.yaml, env vars, etc). This implementation avoids a previously discussed approach of changing bools to bool pointers and instead mimics an approach taken to handle aliases where a nillable fields struct is introduced to assist in detecting the presence of certain fields in an override config.
Some of the team met this morning and agreed to favor this approach over the pointer approach.