Fix Deadlock in StreamChainHead #12250
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What type of PR is this?
Bug Fix
What does this PR do? Why is it needed?
Fixes a deadlock in
StreamChainHeadwhich happens when we are syncing due to how forkchoice locks were refactored.We ignore blocks being streamed in when syncing so as to not acquire the forkchoice read locks.
Which issues(s) does this PR fix?
N.A
Other notes for review