fix(network): Respond to getheaders requests with a maximum of 160 block headers #8913
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Motivation
This PR fixes a bug in Zebra's network protocol implementation where Zebra will return fewer than the expected maximum number of block headers in response to getheaders requests which has been falsely indicating to peers that they have reached the tip of Zebra's chain.
This doesn't strictly block the release if we want to also ignore getheaders requests during Zebra's initial sync.
Closes #8907.
Solution
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