Refector application collection endpoints to not return full Instance objects

[knolleary]

Description

A pair of end points that return lists of Applications and their instances was including the full instance object. This is was far more information than was needed.

This PR changes those endpoints to run an InstanceSummary view which is the minimum information needed for list views.

Affected endpoints:

• /api/v1/application/:id/instances
• /api/v1/teams/:teamId/applications

I have verified all of the users of these endpoints in the UI work with these summaries.

Work to document these changes will happen as part of the api doc work in #1556

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

[Pezmc]

I was worried this would cause troubles in the UI with the cached objects not being full objects any more (with regards to startus, last deploy, etc...), but the work to add an explicit status endpoint seems to have prevented that from being a problem.