Fix path error on windows (#33122)

* fix path error on windows when precision switch is turn on

* fix error

* Update get_pr_ut.py

fix format error

* Update get_pr_ut.py

tools/get_pr_ut.py

@@ -248,13 +248,15 @@ class PRChecker(object):
         return True
 
     def get_all_count(self):
-        os.system(
-            "cd %sbuild && ctest -N|grep 'Total Tests:' | awk -F ': ' '{print $2}' > testCount"
-            % PADDLE_ROOT)
-        f = open("%sbuild/testCount" % PADDLE_ROOT)
-        testCount = f.read()
-        f.close()
-        return int(testCount.strip())
+        p = subprocess.Popen(
+            "cd {}build && ctest -N".format(PADDLE_ROOT),
+            shell=True,
+            stdout=subprocess.PIPE)
+        out, err = p.communicate()
+        for line in out.splitlines():
+            if 'Total Tests:' in str(line):
+                all_counts = line.split()[-1]
+        return int(all_counts)
 
     def get_pr_ut(self):
         """ Get unit tests in pull request. """