[BUG]: New version detection fails with Dev Proxy v0.29

[garrytrinder]

Raised from dotnet/dev-proxy#1271

When using Dev Proxy v0.29, the new version detection mechanism fails. Instead of a version update notification, the toast displays an info message coming directly from the Dev Proxy output, as shown below:

"New Dev Proxy version info 1 error responses loaded from /Users/waldek/github/waldekmastykarz/dev-proxy/DevProxy/bin/Debug/net9.0/devproxy-errors.json is available."

This suggests that the version check is picking up unrelated output messages from Dev Proxy execution, resulting in a confusing notification for the user.

[garrytrinder]

The string is coming from the output of devproxy outdated command which is executed in getOutdatedVersion function.

This suggests a change in behaviour in the 0.29 release.

[garrytrinder]

In v0.28 release we don't get the error responses line in the output.