Merge bitcoin/bitcoin#28090: validation: use noexcept instead of deprecated throw()

047daad clang-tidy: turn on modernize-use-noexcept (fanquake)
85e9e1f validation: use noexcept instead of deprecated throw() (fanquake)

Pull request description:

  We fixed this once before in bitcoin/bitcoin#10965.
  Turn on https://clang.llvm.org/extra/clang-tidy/checks/modernize/use-noexcept.html#modernize-use-noexcept.

ACKs for top commit:
  MarcoFalke:
    lgtm ACK 047daad
  sipa:
    utACK 047daad
  Empact:
    utACK bitcoin/bitcoin@047daad
  stickies-v:
    ACK 047daad

Tree-SHA512: 949b0fe598d66583747853094db13f196b402000e601f8634e5a708b55454d29c5aa18eaf1f2420d3ccf10e3e524b7414ff3a6fe4cb431420bf749c22b2b8bab

Author: fanquake

src/.clang-tidy

@@ -4,6 +4,7 @@ bugprone-argument-comment,
 bugprone-use-after-move,
 misc-unused-using-decls,
 modernize-use-default-member-init,
+modernize-use-noexcept,
 modernize-use-nullptr,
 performance-*,
 -performance-inefficient-string-concatenation,

src/validation.cpp

@@ -5161,7 +5161,7 @@ static void FlushSnapshotToDisk(CCoinsViewCache& coins_cache, bool snapshot_load
 
 struct StopHashingException : public std::exception
 {
-    const char* what() const throw() override
+    const char* what() const noexcept override
     {
         return "ComputeUTXOStats interrupted.";
     }