cmake: use format for ws checks (#403)

With the following PR, we no longer need to roll our own whitespace
check in ci because the format target itself will cover it as it already
does for cmake, clang, and python formatting.

apache/trafficserver#12696

Author: bneradt

jenkins/github/format.pipeline

@@ -58,28 +58,30 @@ pipeline {
                 echo 'Starting build'
                 dir('src') {
                     sh '''#!/bin/bash
-                            set -x
-                            git grep -IE ' +$' | fgrep -v 'lib/yamlcpp' | fgrep -v 'lib/Catch2' | fgrep -v 'lib/systemtap' | fgrep -v '.gold:' | fgrep -v '.test_input'
-                            if [ "1" != "$?" ]; then
-                                echo "Error: Trailing whitespaces are not allowed!"
-                                echo "Error: Please run: git grep -IE ' +$'"
-                                exit 1
-                            fi
-                            echo "Success! No trailing whitespace"
-                            git grep -IE $'\r$' | fgrep -v 'lib/yamlcpp' | fgrep -v 'lib/Catch2' | fgrep -v 'lib/systemtap' | fgrep -v '.test_input'
-                            if [ "1" != "$?" ]; then
-                                echo "Error: Please make sure to run dos2unix on the above file(s)"
-                                exit 1
-                            fi
-                            echo "Success! No DOS carriage return"
-
-                            set -x
 
                             if [ -d cmake ]
                             then
                                 cmake -B build
                                 cmake --build build --target format || exit 1
                             else
+                                # The following whitespace checks were added to the `format` cmake target in 10.2.0, but are not backported to 9.x.
+                                set -x
+                                git grep -IE ' +$' | fgrep -v 'lib/yamlcpp' | fgrep -v 'lib/Catch2' | fgrep -v 'lib/systemtap' | fgrep -v '.gold:' | fgrep -v '.test_input'
+                                if [ "1" != "$?" ]; then
+                                    echo "Error: Trailing whitespaces are not allowed!"
+                                    echo "Error: Please run: git grep -IE ' +$'"
+                                    exit 1
+                                fi
+                                echo "Success! No trailing whitespace"
+                                git grep -IE $'\r$' | fgrep -v 'lib/yamlcpp' | fgrep -v 'lib/Catch2' | fgrep -v 'lib/systemtap' | fgrep -v '.test_input'
+                                if [ "1" != "$?" ]; then
+                                    echo "Error: Please make sure to run dos2unix on the above file(s)"
+                                    exit 1
+                                fi
+                                echo "Success! No DOS carriage return"
+
+                                set -x
+
                                 # Pre 10.x branches only supported autotools.
                                 autoreconf -if && ./configure && make clang-format || exit 1