CI: enable clang-tidy readability-duplicate-include (#26554)

Signed-off-by: kuralme <kuralme@protonmail.com>

platforms/posix/src/px4/common/px4_posix_impl.cpp

@@ -39,7 +39,6 @@
 
 #include <px4_platform_common/defines.h>
 #include <px4_platform_common/workqueue.h>
-#include <px4_platform_common/defines.h>
 #include <px4_platform_common/time.h>
 #include <stdint.h>
 #include <stdio.h>

platforms/posix/src/px4/common/tasks.cpp

@@ -46,7 +46,6 @@
 #include <signal.h>
 #include <fcntl.h>
 #include <sched.h>
-#include <unistd.h>
 #include <string.h>
 #include <pthread.h>
 #include <limits.h>