[feature] Clear deprecated sign of templates/commands

[yoshwata]

What happened:

• Users applies a deprecated template to their pipeline
• Users of template tends to use it continuously even if it has been deprecated.

What you expected to happen: These are just idea.

• UI shows deprecated sign on detail or list screen to make easy to notice
• Build logs shows the template is already deprecated

How to reproduce it: None

[tkyi]

Hm, would you deprecate a whole template in general? Or just a single version of a template? We originally had the idea of being able to set a lifespan for a version of a template: https://github.com/screwdriver-cd/screwdriver/issues/616#issue-237051764

Not sure if that would be similar to what you're asking for

[yoshwata]

@tkyi Thank you for response. This is for a whole template in general. If that lifespan idea is just for single version, another idea is needed for handling the state of a whole template.

[tkyi]

Ah I see makes sense 👍 Not sure how we would keep track of the state of the whole template, since the DB is currently storing distinct template versions. Might need a separate table for that?