Changes and fixes I have made to the builder.yml

Changes and fixes I have made to the builder.yml
 - Installing java-21 insted of java-17(EOL)
 - Stoping unattended-upgrades to avoid conflicts
 - Refreshes the apt package cache to ensure the system has the latest package metadata before performing upgrades
 - Upgrades all installed packages to their latest versions on debian based systems and cleans up unused dependencies and cached files
 - Updates the package cache and upgrades all packages to their latest versions on redhat based systems
 - Updates the package cache and upgrades all packages on suse based systems
 - Fixing the task - "get github host key from github if necessary" that checks github_host_key == "" but since github_host_key is undefined, ansible throws an error
 - Fixing the taks - "Install the systemd unit files for jenkins" by using playbook_dir for explicit path resolution

Signed-off-by: Adam Kraitman <akraitma@li-8b09b2cc-35b7-11b2-a85c-cd1dbade58f9.ibm.com>