Public api PipelineBasic Entity should hold more keys

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Now the keys this entity holds are rather limited, eventhough we have more data available without extra preloads or a lot of computational effort.

I propose adding the following:

• created_at
• started_at
• finished_at
• tag
• before_sha
• duration
• scheduled (bool, check if pipeline.pipeline_schedule_id.present?`)
• triggered (idem)
• auto_cancelled (idem)

Now, we expose only:

• id
• sha
• ref
• status

/cc @dosuken123 @grzesiek @bikebilly