Offer in-place replacement YAML to remove dependency on the Shell++ task

[jessehouwing]

I don't think the Shell++ task does anything special that isn't supported by the out of the box bash task nowadays. People should probably be urged to remove their dependency on this task and use the bash or shell task instead.

Ideally the task would spit out a verbose message with the equivalent YAML syntax to add to the workflow file.

But a deprecation message with the pointer to use the official task instead is probably just warranted.