test: add skip_if_running_under_valgrind()

Enable it in the USDT tests. The context (from 0xB10C):

> every time the tracepoint is reached a SIGTRAP is fired.
> No matter the tracepoint contents, even with an empty one.
> Valgrind intercepts SIGTRAP and aborts.

See discussion in #32374.

test/functional/interface_usdt_coinselection.py

@@ -117,6 +117,7 @@ class CoinSelectionTracepointTest(BitcoinTestFramework):
         self.skip_if_no_python_bcc()
         self.skip_if_no_bpf_permissions()
         self.skip_if_no_wallet()
+        self.skip_if_running_under_valgrind()
 
     def get_tracepoints(self, expected_types):
         events = []

test/functional/interface_usdt_mempool.py

@@ -158,6 +158,7 @@ class MempoolTracepointTest(BitcoinTestFramework):
         self.skip_if_no_bitcoind_tracepoints()
         self.skip_if_no_python_bcc()
         self.skip_if_no_bpf_permissions()
+        self.skip_if_running_under_valgrind()
 
     def added_test(self):
         """Add a transaction to the mempool and make sure the tracepoint returns

test/functional/interface_usdt_net.py

@@ -254,6 +254,7 @@ class NetTracepointTest(BitcoinTestFramework):
         self.skip_if_no_bitcoind_tracepoints()
         self.skip_if_no_python_bcc()
         self.skip_if_no_bpf_permissions()
+        self.skip_if_running_under_valgrind()
 
     def run_test(self):
         self.p2p_message_tracepoint_test()

test/functional/interface_usdt_utxocache.py

@@ -150,6 +150,7 @@ class UTXOCacheTracepointTest(BitcoinTestFramework):
         self.skip_if_no_bitcoind_tracepoints()
         self.skip_if_no_python_bcc()
         self.skip_if_no_bpf_permissions()
+        self.skip_if_running_under_valgrind()
 
     def run_test(self):
         self.wallet = MiniWallet(self.nodes[0])

test/functional/interface_usdt_validation.py

@@ -64,6 +64,7 @@ class ValidationTracepointTest(BitcoinTestFramework):
         self.skip_if_no_bitcoind_tracepoints()
         self.skip_if_no_python_bcc()
         self.skip_if_no_bpf_permissions()
+        self.skip_if_running_under_valgrind()
 
     def run_test(self):
         # Tests the validation:block_connected tracepoint by generating blocks

test/functional/test_framework/test_framework.py

@@ -1016,6 +1016,11 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         if not self.is_external_signer_compiled():
             raise SkipTest("external signer support has not been compiled.")
 
+    def skip_if_running_under_valgrind(self):
+        """Skip the running test if Valgrind is being used."""
+        if self.options.valgrind:
+            raise SkipTest("This test is not compatible with Valgrind.")
+
     def is_cli_compiled(self):
         """Checks whether bitcoin-cli was compiled."""
         return self.config["components"].getboolean("ENABLE_CLI")