fix: Separate project's and core app ingress annotations

[ppawlowski]

Description

This pull request separates the ingress annotations for the project's (NR instances) and the core application.
Custom annotations for NR instances can now be defined using the forge.projectIngressAnnotation variable.
To prevent breaking changes, the existing ingress.annotations will continue to be used as the value for the INGRESS_ANNOTATIONS environment variable within the core application if forge.projectIngressAnnotation is not defined.

Related Issue(s)

Closes #475

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 FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

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