Uninstall during extension upgrade prompts with errors

[chrisdias]

Testing #52811

• Manually install a version of an extension that is earlier than what is in the marketplace. For example, I built a version of the vscode-docker extension that is version 0.0.25 and installed it with code-insiders --install-extension ...
• Open VS Code, open extension viewlet and see that there is a prompt to upgrade to 0.0.27. Click on the update button in the editor (not in the extension viewlet)
• Notice how in the editor view the button changes to Uninstall. Click on that while installing
• Result is a Failed to update: 'peterjausovec.vscode-docker'. notification
• Now, in the editor view the button is back to Update to 0.0.27, click on it
• Result: Nothing happens
• Click again, get another error prompt.
• Reload window, the extension is no longer installed

[sandy081]

Editor should not show Uninstall action while the extension is being installed. It should show Installing Action