Merge bitcoin/bitcoin#30571: test: [refactor] Use m_rng directly

948238a683 test: Remove FastRandomContext global (Ryan Ofsky)
fa0fe08eca scripted-diff: [test] Use g_rng/m_rng directly (MarcoFalke)
fa54cab473 test: refactor: Accept any RandomNumberGenerator in RandMoney (MarcoFalke)
68f77dd21e test: refactor: Pass rng parameters to test functions (Ryan Ofsky)
fa19af555d test: refactor: Move g_insecure_rand_ctx.Reseed out of the helper that calls MakeRandDeterministicDANGEROUS (MarcoFalke)
3dc527f460 test: refactor: Give unit test functions access to test state (Ryan Ofsky)
fab023e177 test: refactor: Make unsigned promotion explicit (MarcoFalke)
fa2cb654ec test: Add m_rng alias for the global random context (MarcoFalke)
fae7e3791c test: Correct the random seed log on a prevector test failure (MarcoFalke)

Pull request description:

  This is mostly a style-cleanup for the tests' random generation:

  1) `g_insecure_rand_ctx` in the tests is problematic, because the name is a leftover when the generator was indeed insecure. However, now the generator is *deterministic*, because the seed is either passed in or printed (c.f. RANDOM_CTX_SEED). Stating that deterministic randomness is insecure in the tests seems redundant at best. Fix it by just using `m_rng` for the name.

  2) The global random context has many one-line aliases, such as `InsecureRand32`. This is problematic, because the same line of code may use the context directly and through a wrapper at the same time. For example in net_tests (see below). This inconsistency is harmless, but confusing. Fix it by just removing the one-line aliases.

  ```
  src/test/net_tests.cpp:        auto msg_data_1 = g_insecure_rand_ctx.randbytes<uint8_t>(InsecureRandRange(100000));
  ````

  3) The wrapper for randmoney has the same problem that the same unit test uses the context directly and through a wrapper at the same time. Also, it has a single type of Rng hardcoded. Fix it by accepting any type.

ACKs for top commit:
  hodlinator:
    ACK 948238a683
  ryanofsky:
    Code review ACK 948238a683. Only changes since last review were changing a comments a little bit.
  marcofleon:
    Code review ACK 948238a683. Only changes since my last review are the improvements in `prevector_tests`.

Tree-SHA512: 69c6b46a42cb743138ee8c87ff26a588dbe083e3efb3dca49b8a133ba5d3b09e8bf01c590ec7e121a7d77cb1fd7dcacd927a9ca139ac65e1f7c6d1ec46f93b57

src/test/miniscript_tests.cpp

@@ -341,13 +341,14 @@ void SatisfactionToWitness(miniscript::MiniscriptContext ctx, CScriptWitness& wi
     witness.stack.push_back(*builder.GetSpendData().scripts.begin()->second.begin());
 }
 
+struct MiniScriptTest : BasicTestingSetup {
 /** Run random satisfaction tests. */
 void TestSatisfy(const KeyConverter& converter, const std::string& testcase, const NodeRef& node) {
     auto script = node->ToScript(converter);
     auto challenges = FindChallenges(node); // Find all challenges in the generated miniscript.
     std::vector<Challenge> challist(challenges.begin(), challenges.end());
     for (int iter = 0; iter < 3; ++iter) {
-        std::shuffle(challist.begin(), challist.end(), g_insecure_rand_ctx);
+        std::shuffle(challist.begin(), challist.end(), m_rng);
         Satisfier satisfier(converter.MsContext());
         TestSignatureChecker checker(satisfier);
         bool prev_mal_success = false, prev_nonmal_success = false;
@@ -489,10 +490,11 @@ void Test(const std::string& ms, const std::string& hexscript, const std::string
          /*opslimit=*/-1, /*stacklimit=*/-1,
          /*max_wit_size=*/std::nullopt, /*max_tap_wit_size=*/std::nullopt, /*stack_exec=*/std::nullopt);
 }
+}; // struct MiniScriptTest
 
 } // namespace
 
-BOOST_FIXTURE_TEST_SUITE(miniscript_tests, BasicTestingSetup)
+BOOST_FIXTURE_TEST_SUITE(miniscript_tests, MiniScriptTest)
 
 BOOST_AUTO_TEST_CASE(fixed_tests)
 {