UI element to show that passed data is outdated and needs to be refreshed

[yannickperrenet]

Describe the feature you'd love to have in Orchest
Idea is based on: #132

Let's assume you have the following pipeline: A -> B -> C.

If you run the pipeline, then all steps will have outputted their data to disk. Once you later only run A, the data contained on disk for step B is outdated (since it doesn't use the up to date output of step A). Thus if you run step C, then it will use the outdated data.

Is your feature request related to a problem? Please describe.
Unsure whether the data that is used as input to a step is "up-to-date". Especially given that the disk data is never removed.