Add workflow to auto-dismiss owner from Copilot PRs and enable auto-merge#4

Copilot wants to merge 3 commits intomainGhostwheeI/SteamLibraryUpdater:mainfrom

copilot/create-auto-dismiss-reviewer-workflowGhostwheeI/SteamLibraryUpdater:copilot/create-auto-dismiss-reviewer-workflowCopy head branch name to clipboard