Fix flaky Emacs e2e test: replace fixed sleep with diagnostic polling loop#2276

andyleejordan merged 2 commits intoupdatesPowerShell/PowerShellEditorServices:updatesfrom

copilot/fix-powershell-editor-services-testPowerShell/PowerShellEditorServices:copilot/fix-powershell-editor-services-testCopy head branch name to clipboard