Update installation script to replace sleep with shellScript

Replaced the fixed sleep duration with repeated shellScript calls to improve the script's flexibility and manageability. This change aims to enhance the installation process by providing clearer execution control and better

Author: Shivam-nagar23

manifests/installation-script

@@ -1,4 +1,6 @@
 LTAG="v1.6.0";
 REPO_RAW_URL="https://raw.githubusercontent.com/devtron-labs/devtron/";
-sleep(180);
+ignore = shellScript sleep50;
+ignore = shellScript sleep50;
+ignore = shellScript sleep50;
 log("executed devtron setup installation");