Merge bitcoin/bitcoin#34677: kernel: Chainparams and headerssync updates pre-31.0

44538f8ada kernel: Add recent assumeutxo snapshot info (Ava Chow)
58c2e23fca kernel: Update headerssync params (Ava Chow)
cf261b071f kernel: update chainTxData (Ava Chow)
8eaf1d26d4 kernel: update defaultAssumeValid and minimumChainWork (Ava Chow)
5ca0c55517 kernel: update assumed blockchain and chainstate sizes (Ava Chow)

Pull request description:

  Update chainparams and headerssync params per the release process.

  Also added new assumeutxo snapshots for each network. I've uploaded snapshots to https://achow101.com/files/utxo-snapshots/

ACKs for top commit:
  Sjors:
    ACK 44538f8ada
  fjahr:
    ACK 44538f8ada
  janb84:
    ACK 44538f8ada
  sipa:
    ACK 44538f8ada. I re-did all the mainnet parameters, but did not look closely at the other networks.
  jaonoctus:
    ACK 44538f8ada

Tree-SHA512: f9b6ccc967c5ef58f734245df459c3136491e9b6a0f6e36f4272bc0787e7b59eabe47a8c8b19a90267eca4a0b5851dfbf45153f96eac599c417f148b3cf264cf

contrib/devtools/headerssync-params.py

@@ -12,13 +12,13 @@ import random
 # Parameters:
 
 # Aim for still working fine at some point in the future. [datetime]
-TIME = datetime(2028, 4, 2)
+TIME = datetime(2028, 10, 10)
 
 # Expected block interval. [timedelta]
 BLOCK_INTERVAL = timedelta(seconds=600)
 
 # The number of headers corresponding to the minchainwork parameter. [headers]
-MINCHAINWORK_HEADERS = 912683
+MINCHAINWORK_HEADERS = 938343
 
 # Combined processing bandwidth from all attackers to one victim. [bit/s]
 # 6 Gbit/s is approximately the speed at which a single thread of a Ryzen 5950X CPU thread can hash