[BACKPORT 2024.1][PLAT-14368]: Fix release GC in yml task.

Summary:
Fixes release GC code and tail -n +x prints line from (x+1) as we always want to retain last old release.
Earlier, it was tail -n +3 but this also removes the old release so modified to 4.

Original diff/commit: fe19c06/D36074

Test Plan: Tested manually

Reviewers: sanketh, svarshney

Reviewed By: svarshney

Subscribers: yugaware

Tags: #jenkins-ready

Differential Revision: https://phorge.dev.yugabyte.com/D36133

managed/devops/roles/install_package/tasks/main.yml

@@ -112,7 +112,7 @@
 # doing num_releases_to_keep + 2 because we need to protect 'TEMPORARY' directory under yb-software
 - name: Remove older yb software folders
   shell: "ls --ignore='ybc*' \"{{ yb_software_dir }}\" -t | \
-      tail -n +{{ num_releases_to_keep + 2 }} | \
+      tail -n +{{ num_releases_to_keep + 3 }} | \
       xargs -I{} --no-run-if-empty rm -rv \"{{ yb_software_dir }}/{}\" --"
   register: rm_yb_softwares_result
   tags: