clang-tidy: Update HeaderFilterRegex to only scan files in subdir "(ns*)|(NS*)"

.clang-tidy

@@ -45,5 +45,5 @@ Checks: >
   readability-uppercase-literal-suffix,
 
 FormatStyle: "file"
-HeaderFilterRegex: "(contrib|examples|src|scratch|utils)/*/.*h"
+HeaderFilterRegex: ".*(ns|NS).*/(contrib|examples|src|scratch|utils)/*/.*h"
 UseColor: true

utils/tests/gitlab-ci-code-linting.yml

@@ -79,7 +79,7 @@ clang-tidy-diff:
     - git fetch upstream master
     - git diff -U0 upstream/master |
       clang-tidy-diff-14.py -path cmake-cache/ -p1 -quiet -use-color
-      -iregex "(contrib|examples|src|scratch|utils)\/.+\.(cpp|cc|cxx|c|h|hpp)"
+      -iregex ".*(ns|NS).*\/(contrib|examples|src|scratch|utils)\/.+\.(cpp|cc|cxx|c|h|hpp)"
       1> $CLANG_TIDY_OUTPUT
       2> /dev/null
     - if egrep -A 3 "file not found \[clang-diagnostic-error\]" $CLANG_TIDY_OUTPUT ; then