Ensure instance logs refresh after unsuspending an instance

[knolleary]

Fixes #2083

Description

The logs view was clearing the refresh interval when an instance was in suspended state. However if the instance came out of suspended state it wasn't restoring the refresh interval so the logs would never update.

This keeps the interval running all the time the view is mounted - but only polls for logs if the state is not suspended.

It also clears the log history when we detect the instance is suspended; with the existing behaviour, when you suspended then started an instance the previous logs would be shown for a couple of seconds whilst it retrieved the new logs.

Related Issue(s)

#2083

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on flowforge/helm to update ConfigMap Template
  • Issue/PR raised on flowforge/CloudProject to update values for Staging/Production

Labels

• Backport needed? -> add the backport label
• Includes a DB migration? -> add the area:migration label