Retry fetching release notes on failure, and display failures #101158
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This PR fixes #101132
As you can see in the issue, this is how to test it:
Go offline (you can also open devtools in vscode and go to the network tab and change the "online" at the top to "offline")
Try to open the release notes using Show Release Notes from the command palette.
Depending on whether you are on an official vscode build or a local build, the release notes page will be opened in your default browser. On a local build it should show an error stating that fetching the release notes failed and that this vscode doesn't have release notes online.
Go back online
Try to open the release notes again
The release notes should open in a webview
Go offline again
Try to open the release notes again
The release notes should open in a webview again, even though we're offline