refactor: use c++20 std::views::reverse instead of reverse_iterator.h

Use std::ranges::views::reverse instead of the implementation in
reverse_iterator.h, and remove it as it is no longer used.

contrib/devtools/copyright_header.py

@@ -19,7 +19,6 @@ EXCLUDE = [
     'src/qt/bitcoinstrings.cpp',
     'src/chainparamsseeds.h',
     # other external copyrights:
-    'src/reverse_iterator.h',
     'src/test/fuzz/FuzzedDataProvider.h',
     'src/tinyformat.h',
     'src/bench/nanobench.h',