merge bitcoin#21599: Replace file level integer overflow suppression with function level suppression

Author: kwvg

test/sanitizer_suppressions/ubsan

@@ -1,6 +1,6 @@
 # -fsanitize=undefined suppressions
 # =================================
-# No suppressions at the moment. Hooray!
+signed-integer-overflow:CTxMemPool::PrioritiseTransaction
 
 # -fsanitize=integer suppressions
 # ===============================
@@ -100,5 +100,4 @@ shift-base:leveldb/
 shift-base:net_processing.cpp
 shift-base:streams.h
 shift-base:util/bip32.cpp
-signed-integer-overflow:txmempool.cpp
 vptr:bls/bls.h