script: Enhance validations in utxo_snapshot.sh
debc1be254f1
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Description

script: Enhance validations in utxo_snapshot.sh

Summary:

Ensure that the snapshot height is higher than the pruned block height when the node is pruned.
Validate the correctness of the file path and check if the file already exists.
Make network activity disablement optional for the user.
Ensure the reconsiderblock command is triggered on exit, even in the case of user interruption (Ctrl-C).
Fix block height out of range
Fix hash_serialized_2 -> hash_serialized

This is a backport of core#28852, core#30690

Test Plan:
Backup the datadir.
Start bitcoind in a different terminal and monitor it while the script is running.

$ ./contrib/devtools/utxo_snapshot.sh 888000 ../utxo.dat ./build/src/bitcoin-cli
Do you want to disable network activity (setnetworkactive false) before running invalidateblock? (Y/n): Y
Disabling network activity
false
Rewinding chain back to height 888000 (by invalidating 00000000000000001e72f6310cc606c4a47d71d5168f55b6f96b6a6f61f9f616); this may take a while
Generating UTXO snapshot...
{
  "coins_written": 38780572,
  "base_hash": "00000000000000002b218d995a292c34bc4c0244bb4bbdad18f3a97e88ccb567",
  "base_height": 888000,
  "path": "/data0/ecashd/../utxo.dat",
  "txoutset_hash": "50493f6218661a189654dbad816821a656b519454190c63daf376610e4fa0a7e",
  "nchaintx": 299158458
}
Restoring chain to original height; this may take a while
Restoring network activity
true