Add "one-click" tasks

[JeanMertz]

Another quality-of-life improvement for pipeline-heavy workflows, is having "one-click pipelines" that (as the name implies) don't require any configuration, and run instantly when you click them.

This can again be made client-side only for now, but could be migrated to a server-side implementation once user sessions are a thing.

The idea would be as follows:

• You can create a "one-click pipeline" based on an existing pipeline by opening that pipeline, filling in all required details, and instead of running the pipeline, selecting "save", and giving the pipeline a name.
• These pipelines are visually distinct from others.
• They also have their description removed, as it's assumed you know what it does, so that they take less room in the list of pipelines.
• They are always listed as the top results, above favoured (Add a "favourites" tasks list #9) and regular pipelines.
• If you click them, they open, and then directly run the pipeline with the pre-filled variables.
• Other than that, they behave the same as other pipelines, so they can be filtered using the search bar.

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As for the implementation itself, there are a few things to do:

• Keep a local store of "favourites", which is basically a hashmap of name ➜ { pipelineId, variables }.
• When a list of pipelines is rendered, check if one of the favourite titles matches the search pattern (if any), and inject those at the top.
• When a favourite pipeline is clicked, open a regular pipeline view, pre-fill the variables, and submit the form instantly.

Not sure yet what the best way is to one-click pipelines, but I guess we could start by adding a small x to the left of the pipeline on hover.