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## Summary
In order to adopt react 19's ref-as-prop model, Flow needs to eliminate
all the places where they are treated differently.
`React.AbstractComponent` is the worst example of this, and we need to
eliminate it.
This PR eliminates them from the react repo, and only keeps the one that
has 1 argument of props.
## How did you test this change?
yarn flow
Stacked on #31299.
We already have an option for resolving Client References to other
Client References when consuming an RSC payload on the server.
This lets you resolve Server References on the consuming side when the
environment where you're consuming the RSC payload also has access to
those Server References. Basically they becomes like Client References
for this consumer but for another consumer they wouldn't be.
