test: Move valgrind.supp to the other sanitizer_suppressions files

contrib/valgrind.supp

@@ -1,52 +0,0 @@
-# This valgrind suppressions file includes known Valgrind warnings in our
-# dependencies that cannot be fixed in-tree.
-#
-# Example use:
-# $ valgrind --suppressions=contrib/valgrind.supp build/bin/test_bitcoin
-# $ valgrind --suppressions=contrib/valgrind.supp --leak-check=full \
-#       --show-leak-kinds=all build/bin/test_bitcoin
-#
-# To create suppressions for found issues, use the --gen-suppressions=all option:
-# $ valgrind --suppressions=contrib/valgrind.supp --leak-check=full \
-#       --show-leak-kinds=all --gen-suppressions=all --show-reachable=yes \
-#       --error-limit=no build/bin/test_bitcoin
-#
-# Note that suppressions may depend on OS and/or library versions.
-# Tested on aarch64 and x86_64 with Ubuntu Noble system libs, using clang-16
-# and GCC, without gui.
-{
-   Suppress leaks on shutdown
-   Memcheck:Leak
-   ...
-   fun:_Z8ShutdownR11NodeContext
-}
-{
-   Suppress leveldb leak
-   Memcheck:Leak
-   match-leak-kinds: reachable
-   fun:_Znwm
-   ...
-   fun:_ZN7leveldb6DBImpl14BackgroundCallEv
-}
-{
-   Suppress leveldb leak
-   Memcheck:Leak
-   fun:_Znwm
-   ...
-   fun:GetCoin
-}
-{
-   Suppress LogInstance still reachable memory warning
-   Memcheck:Leak
-   match-leak-kinds: reachable
-   fun:_Znwm
-   fun:_Z11LogInstancev
-}
-{
-   Suppress BCLog::Logger::StartLogging() still reachable memory warning
-   Memcheck:Leak
-   match-leak-kinds: reachable
-   fun:malloc
-   ...
-   fun:_ZN5BCLog6Logger12StartLoggingEv
-}