Add Heroku Pipelines

[OJFord]

The currently used Go binding doesn't support them, though.

However, Heroku's API itself does.

Given that the library's generated from a schema, and that generator has been broken since 2014 (cf. heroku/heroku-go#9; interagent/schematic#29) might it be worth abandoning it in favour of HTTP requests at this point?

[danp]

Fixed by #14078

[catsby]

Closed by #14078

[ghost]

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