Uninstalling
Free your license, keep your rules, then remove PPROLint from Premiere Pro.
1. Free the license
Deactivate PPROLint in the panel's License Settings dialog, so the license is free for another computer. If you forgot, aescripts can free it: see Your license.
2. Keep your rules
Your own rules and your changes to built-in rules are files in the rules folder of PPROLint. To keep them, open Settings > Rules > Open rules folder and copy the *.rule.json files somewhere else. Removing the plugin may remove that folder with it.
3. Remove the plugin
In the Creative Cloud desktop app, open the list of your installed plugins, find PPROLint and uninstall it from its menu. Plugins installed from a .ccx file are listed there too.
Restart Premiere Pro: the PPROLint panels are gone from Window > UXP Plugins.
Your license stays valid: reinstall PPROLint and activate it again whenever you like.