Support handling of Abseil independently of Protobuf. #17414
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Summary
This is needed for otel support.
If Protobuf gets vendored, we unconditionally vendor Abseil as well to avoid the possibility of conflicts from mixing versions. Otherwise, we try to find a usable copy on the system itself, and if we can’t we pull a vendored copy.
Detection is keyed off of the specific list of required components. For the moment this adds all requested components to all targets that it is asked to link Abseil to, target-specific component lists will be revisited if we add any other code that depends on Abseil.
Test Plan
CI passes on this PR.
Any further testing requires the otel support code