message: test: Do not bump depth in host functions
  This removes the test cases where host functions dump the wasm call
  depth. This is still possible (two cases doing that remain) but not
  recommended implementation.
diff: @@ -85,7 +85,7 @@ TEST(execute_call_depth, execute_imported_host_function)
  TEST(execute_call_depth, execute_imported_host_function_calling_wasm_function)
  {
  // The imported host function $host_f is executed first. It then calls $leaf internal wasm
  - // function. The host function is obligated to bump depth and pass it along.
  + // function. The host function does not bump the call depth.
  /* wat2wasm
  (func $host_f (import "host" "f") (result i32))
  @@ -97,7 +97,7 @@ TEST(execute_call_depth, execute_imported_host_function_calling_wasm_function)
  static int recorded_depth;
  constexpr auto host_f = [](std::any&, Instance& instance, const Value*, int depth) noexcept {
  recorded_depth = depth;
  - return fizzy::execute(instance, 1, {}, depth + 1);
  + return fizzy::execute(instance, 1, {}, depth);
  };
  const auto module = parse(wasm);
  @@ -111,8 +111,9 @@ TEST(execute_call_depth, execute_imported_host_function_calling_wasm_function)
  EXPECT_THAT(execute(*instance, 0, {}, DepthLimit - 2), Result(1_u32));
  EXPECT_EQ(recorded_depth, DepthLimit - 2);
  + // Host function is not included in the depth limit, so 1 slot is enough.
  recorded_depth = -1000;
  - EXPECT_THAT(execute(*instance, 0, {}, DepthLimit - 1), Traps());
  + EXPECT_THAT(execute(*instance, 0, {}, DepthLimit - 1), Result(1_u32));
  EXPECT_EQ(recorded_depth, DepthLimit - 1);
  recorded_depth = -1000;
  