* remove peer-exchange from @waku/core
- also removes the manual test for peer-exchange (assumption is that the
only way to initialise peer-exchange is through libp2p's peerDiscovery and
not manually) (ref:
https://github.com/waku-org/js-waku/pull/1158#discussion_r1108055234)
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* fix: build
* update interop test
* decrease test duration for px auto discovery
* rm: only for tests
* address comment
