refactor: move CConnman and PeerManager out of CDeterministicMNManager, LLMQContext member ctors, reduce use in CJContext

[kwvg]

Additional Information

• Depends on refactor: move CInstantSendManager::AskNodesForLockedTx into PeerManager #6425
• Dependency for backport: merge bitcoin#23280 (coalesce chainstate loading sequence between {,non-}unittest codepaths) #6304
• In order to reduce the logic used in chainstate initialization (that will be split out of init.cpp in bitcoin#23280), the spinning up of threads (as done in LLMQContext::Start()) needs to be moved down.
  • They were moved up in dash#5752 as CBLSWorker is a part of LLMQContext and CBLSWorker is needed during chainstate verification. As suggested in dash#5752, an alternate fix to the one already merged in was to move CBLSWorker Start()/Stop() to the constructor, which is done here.
    • Another alternate fix is that we move it out of LLMQContext entirely and let it remain in NodeContext though this approach has not been taken.
  • The reason we cannot retain the status quo is because bitcoin-chainstate (the binary introduced in bitcoin#24304 that's built on the code split off in bitcoin#23280) aims to be devoid of P2P logic and this is reflected in the source files used to build it (source). (Also, there's no NodeContext, source)
    • This means need to separate P2P and validation components from Dash-specific logic in order for the split to work as expected. This PR is a step in that direction by moving P2P elements (CConnman and PeerManager) out of constructors.
• As it stands, there are two sources for Dash-specific components to have access to P2P components, initialization (e.g. through LLMQContext::Start() or PeerManagerImpl::ProcessMessage()).

Breaking Changes

None expected. While changes are present in initialization order, consensus behaviour should remain unchanged.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas (note: N/A)
• I have added or updated relevant unit/integration/functional/e2e tests (note: N/A)
• I have made corresponding changes to the documentation (note: N/A)
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

[github-actions]

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[kwvg]

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