Merge bitcoin/bitcoin#27425: test: move remaining rand code from util/setup_common to util/random

1cd45d4e08 test: move random.h include header from setup_common.h to cpp (Jon Atack)
1b246fdd14 test: move remaining random test util code from setup_common to random (jonatack)

Pull request description:

  and drop the `util/random` dependency on `util/setup_common`.  This improves code separation and allows `util/setup_common` to call `util/random` functions without creating a circular dependency, thereby addressing https://github.com/bitcoin/bitcoin/pull/26940#issuecomment-1497266140 by glozow (thanks!)

ACKs for top commit:
  MarcoFalke:
    lgtm ACK 1cd45d4e08 🌂

Tree-SHA512: 6ce63d9103ba9b04eebbd8ad02fe9aa79e356296533404034a1ae88e9b7ca0bc9a5c51fd754b71cf4e7b55b18bcd4d5474b2d588edee3851e3b3ce0e4d309a93

src/wallet/test/wallet_tests.cpp

@@ -15,6 +15,7 @@
 #include <policy/policy.h>
 #include <rpc/server.h>
 #include <test/util/logging.h>
+#include <test/util/random.h>
 #include <test/util/setup_common.h>
 #include <util/translation.h>
 #include <validation.h>