Merge bitcoin/bitcoin#26770: ci: Move --enable-c++20 from "tidy" task back to "ASan..." one

afc6052 ci: Move `--enable-c++20` from "tidy" task back to "ASan..." one (Hennadii Stepanov)

Pull request description:

  This PR reverts cc7335e from bitcoin/bitcoin#25528 partially.

  C++20 has introduced some new headers, and it is premature to consider them when using the IWYU tool.

  Required for bitcoin/bitcoin#26763 and bitcoin/bitcoin#26766.

  Related discussions:
  - bitcoin/bitcoin#25528 (comment)
  - bitcoin/bitcoin#26763 (comment)

ACKs for top commit:
  MarcoFalke:
    review only ACK afc6052

Tree-SHA512: 9c1d3317d0f7a94d46d1e442da1a91669cd9ed1e62a41579edc96e1f5447551b536d32eeb222caf277e85228482753be545e0a874208cb24f9a8491fce3b6d9f

Author: MarcoFalke

ci/test/00_setup_env_native_asan.sh

@@ -23,4 +23,4 @@ export PACKAGES="systemtap-sdt-dev clang llvm python3-zmq qtbase5-dev qttools5-d
 export DOCKER_NAME_TAG=ubuntu:22.04
 export NO_DEPENDS=1
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-usdt --enable-zmq --with-incompatible-bdb --with-gui=qt5 CPPFLAGS='-DARENA_DEBUG -DDEBUG_LOCKORDER' --with-sanitizers=address,integer,undefined CC=clang CXX=clang++"
+export BITCOIN_CONFIG="--enable-c++20 --enable-usdt --enable-zmq --with-incompatible-bdb --with-gui=qt5 CPPFLAGS='-DARENA_DEBUG -DDEBUG_LOCKORDER' --with-sanitizers=address,integer,undefined CC=clang CXX=clang++"

ci/test/00_setup_env_native_tidy.sh

@@ -15,5 +15,5 @@ export RUN_FUNCTIONAL_TESTS=false
 export RUN_FUZZ_TESTS=false
 export RUN_TIDY=true
 export GOAL="install"
-export BITCOIN_CONFIG="CC=clang CXX=clang++ --enable-c++20 --with-incompatible-bdb --disable-hardening CFLAGS='-O0 -g0' CXXFLAGS='-O0 -g0'"
+export BITCOIN_CONFIG="CC=clang CXX=clang++ --with-incompatible-bdb --disable-hardening CFLAGS='-O0 -g0' CXXFLAGS='-O0 -g0'"
 export CCACHE_SIZE=200M