Merge bitcoin/bitcoin#18554: wallet: ensure wallet files are not reused across chains

5f213213cb tests: add tests for cross-chain wallet use prevention (Seibart Nedor)
968765973b wallet: ensure wallet files are not reused across chains (Seibart Nedor)

Pull request description:

  This implements a proposal in #12805 and is a rebase of #14533.

  This seems to be a working approach, but I'm not sure why the `p2p_segwit.py` functional test needed a change, so I'll look into it more.

ACKs for top commit:
  achow101:
    ACK 5f213213cb
  dongcarl:
    Code Review ACK 5f213213cb
  [deleted]:
    tACK https://github.com/bitcoin/bitcoin/pull/18554/commits/5f213213cb17429353ef7ec3e97b185af06d236f

Tree-SHA512: 2c934300f113e772fc31c16ef5588526300bbc36e4dcef7d77bd0760c5c8f0ec77f766b1bed5503eb0157fa26dc900ed54d2ad1b41863c1f736ce5c1f3b67bec

test/functional/test_runner.py

@@ -255,6 +255,7 @@ BASE_SCRIPTS = [
     'rpc_bind.py --ipv4',
     'rpc_bind.py --ipv6',
     'rpc_bind.py --nonloopback',
+    'wallet_crosschain.py',
     'mining_basic.py',
     'feature_signet.py',
     'wallet_bumpfee.py --legacy-wallet',