Dynamically pick time range for collector logs searches

## What?
The Graylog Collector UI has links to the received messages and collector system logs for each instance.
The time range on these searches is always 1 hour, which work when the collector is online or just went offline.
However, if the collector has been offline for longer than 1 hour, users would see an empty result and have to remember to manually adjust the time range.

Since we have the last heartbeat timestamp, we can use that to anchor our search time range instead, immediately showing relevant data to the user.

## Your Environment

* Graylog Version: 7.1.0-rc.1
* OpenSearch Version:
* MongoDB Version:
* Operating System:
* Browser version: