Fixes #38991 - Add chained task dependencies in the UI

[ianballou]

Adds dependency information to the Foreman Tasks UI in a new Dependencies tab. Each dependency list is a table that shows the name of the task and the status.

Relates to Dynflow/dynflow#446

[ianballou]

Katello PR to test with: Katello/katello#11540

[adamruzicka]

This is generally what I had in mind, however the tests are red

<screenshot>

Would things fit if a task was blocking and blocked at the same time?

[adamruzicka]

I can't say I'm a huge fan of ad-hoc data formatting. Could we instead have a main rabl json template with this and have the other templates we already have extend it?

[ianballou]

@adamruzicka I moved the data modeling part to a rabl json file and included it in the rabl json here as a partial.

[ianballou]

That way the data is modeled once instead of twice. It's not exactly 'extending' as you mentioned, but lemme know if it does the trick for ya.

[ianballou]

Would things fit if a task was blocking and blocked at the same time?

Here is what it looks like:

Here it is with a squished window:

At the moment, with content views, there is no way to achieve this naturally since composite content views cannot be in other composite content views. But, I could see this happening as more features start to use chaining.

[adamruzicka]

Please bump dependency on dynflow, otherwise lgtm

[ianballou]

@adamruzicka I've addressed the latest comments.

[ianballou]

Rubocop is failing because the version of Ruby is too old.

[adamruzicka]

Would you please include 8fb29ee here?

[ianballou]

@adamruzicka 8fb29ee is included now.

[adamruzicka]

Instead of having this sort of read-only, I would still like to have an interface to actually chain tasks using the foreman-tasks without having users reach into dynflow's internals to manipulate things directly. Something like the previous iteration had

[ianballou]

@adamruzicka I've created the public API for it. Now there is a solid dependency between this PR and Katello/katello#11621, so this will need to merge first.

[ianballou]

@adamruzicka I updated chain to accept either an array of task objects or an active record association. My Katello PR is updated now to use the change and everything is still working.

[adamruzicka]

LGTM

[sjha4]

This is working nicely with the Katello PR with the dependency chaining on autopublish. Able to see the dependencies and blocks relations on the UI and navigate properly to the mapped tasks.

[ianballou]

Thanks for the reviews! Glad to see this getting in, it's been a long time coming.