Init Dag Overview page with time range selector and failed tasks

[bbovenzi]

Initialize the Dag Overview page with a timerange selector that will search for failed task instances in that range and show it as a button with the total count and the distribution of failed tis over the time range.

In another PR: build the tasks page so clicking the button brings you somewhere useful.

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[pierrejeambrun]

Also this just makes me realize that http://localhost:29091/ui/dags/recent_dag_runs?dag_id_pattern=xxxxx endpoint should most certainly also support a dag_id query params or dag_ids.

I am affraid that using a pattern like this could end up matching multiple dags while we are really trying to get the dag_runs from a specific dag like here.

[pierrejeambrun]

Nice, tested locally looks good!