More efficient check of references in save&restore

[georgweiss]

Recently added: annotation of save&restore snapshot and composite snapshots referenced in any composite snapshot. The implementation however is very inefficient as it generates queries to the service whenever JavaFX determines that the TreeCell must be re-rendered.

This PR abandons the annotation strategy to instead disable the Delete menu item if references are found. This way the call to the service happens only when context menu is launched, and only for the selected node, so user will be able to determine if a snapshot or composite snapshot can be deleted before attempting the operation.

• Testing:

  • The feature has automated tests
  • [ X] Tests were run

• Documentation:

  • The feature is documented
  • [ X] The documentation is up to date
  • Release notes:
    • Added an entry if the change is breaking or significant
    • Added an entry when adding a new feature

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

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