Include skbuild directory into build.sh clean operation (#11060)

This PR includes deletion of `_skbuild` build artifacts in `clean` option of `build.sh`

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #11060

Author: galipremsagar

build.sh

@@ -249,7 +249,7 @@ if hasArg clean; then
     done
 
     # Cleaning up python artifacts
-    find ${REPODIR}/python/ | grep -E "(__pycache__|\.pyc|\.pyo|\.so$)"  | xargs rm -rf
+    find ${REPODIR}/python/ | grep -E "(__pycache__|\.pyc|\.pyo|\.so|\_skbuild$)"  | xargs rm -rf
 
 fi