Link searches with adhoc tasks

[bwalkerl]

Currently there are limitations because searches aren't linked to the related ad hoc tasks.

• Link searches with adhoc tasks to get current status, most likely using searchid
• Link with adhoc task logs to get proper duration for failed tasks and log output

This would allow us to:

• Stop showing ETA for failed tasks
• Stop increasing duration for failed tasks (if adding timeend, make sure to update logic that uses it to suggest completion)
• Add danger badge for failed tasks in the progress column
• Clean up ad hoc tasks when deleting searches
• Show delete button for failed tasks (and in progress when Be able to delete a long running search from the UI #61 is implemented)
• Show links to task log output in the GUI

This may be required for #19

[bwalkerl]

The majority of the benefits of this were added without implementing this link by #79 and #61

Only thing left would be showing links to task log output in the GUI, but that's more optional than the others.