Adding the ability to tag tasks for filtering on the index page about maintenance_tasks

[etiennebarrie]

There's a way in Ruby to group things classes: using modules as namespaces. We properly support nesting since #809, maybe we could give a way to filter by module instead of adding the concept of tag?
For example, /maintenance_tasks/ could continue showing all tasks as it does today, but for projects using modules nested under Maintenance, we could list their names at the top of the index, allowing to filter tasks by module.

[lawrencewong]

That would be definitely preferred. We did notice that it was nice that we could have the nested structure, but saw no benefit to it since it didn't help with the ability to filter. I can take a look at making some changes in my PR to reflect that.

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