CI: Increase functional test timeout to 30s

The mutex and semaphore functional tests require significant time to
complete with their original timing parameters (MAX_ITERATIONS=5,
COOPERATION_YIELDS=3, monitor cycles, multiple task yields). Tests were
timing out at 10s before printing PASS criteria.

Author: jserv

.ci/run-functional-tests.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Configuration
-TIMEOUT=5
+TIMEOUT=30
 TOOLCHAIN_TYPE=${TOOLCHAIN_TYPE:-gnu}
 
 # Define functional tests and their expected PASS criteria