Merge bitcoin/bitcoin#28170: p2p: adaptive connections services flags

27f260aa6e04f82dad78e9a06d58927546143a27 net: remove now unused global 'g_initial_block_download_completed' (furszy)
aff7d92b1500e2478ce36a7e86ae47df47dda178 test: add coverage for peerman adaptive connections service flags (furszy)
6ed53602ac7c565273b5722de167cb2569a0e381 net: peer manager, dynamically adjust desirable services flag (furszy)
9f36e591c551ec2e58a6496334541bfdae8fdfe5 net: move state dependent peer services flags (furszy)
f9ac96b8d6f4eba23c88f302b22a2c676e351263 net: decouple state independent service flags from desirable ones (furszy)
97df4e38879d2644aeec34c1eef241fed627333e net: store best block tip time inside PeerManager (furszy)

Pull request description:

  Derived from #28120 discussion.

  By relocating the peer desirable services flags into the peer manager, we
  allow the connections acceptance process to handle post-IBD potential
  stalling scenarios.

  The peer manager will be able to dynamically adjust the services flags
  based on the node's proximity to the tip (back and forth). Allowing the node
  to recover from the following post-IBD scenario:
  Suppose the node has successfully synced the chain, but later experienced
  dropped connections and remained inactive for a duration longer than the limited
  peers threshold (the timeframe within which limited peers can provide blocks). In
  such cases, upon reconnecting to the network, the node might only establish
  connections with limited peers, filling up all available outbound slots. Resulting
  in an inability to synchronize the chain (because limited peers will not provide
  blocks older than the `NODE_NETWORK_LIMITED_MIN_BLOCKS` threshold).

ACKs for top commit:
  achow101:
    ACK 27f260aa6e04f82dad78e9a06d58927546143a27
  vasild:
    ACK 27f260aa6e04f82dad78e9a06d58927546143a27
  naumenkogs:
    ACK 27f260aa6e04f82dad78e9a06d58927546143a27
  mzumsande:
    Light Code Review ACK 27f260aa6e04f82dad78e9a06d58927546143a27
  andrewtoth:
    ACK 27f260aa6e04f82dad78e9a06d58927546143a27

Tree-SHA512: 07befb9bcd0b60a4e7c45e4429c02e7b6c66244f0910f4b2ad97c9b98258b6f46c914660a717b5ed4ef4814d0dbfae6e18e6559fe9bec7d0fbc2034109200953

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