[Core]: Add integration tests

[shivaccuknox]

Add integration tests for controllers in the core to verify the NimbusPolicy and ClusterNimbusPolicy generation.

Scenarios to test:

Create and Read

• Scenario: Create a SecurityIntent and a SecurityIntentBinding.

• Expected outcomes:

  • An intermediary NimbusPolicy is generated with the expected values populated correctly.

  • The created SecurityIntent status subresource includes the ID and action fields with the intent values.
    The created SecurityIntentBinding status subresource reflects the number and names of bound intents, along with the generated NimbusPolicy name.

• Similar test cases for a SecurityIntent with a ClusterSecurityIntentBinding, expecting a ClusterNimbusPolicy generation.

Update

• Scenario: Modify a SecurityIntentBinding

• Expected Outcome:

  • The corresponding NimbusPolicy is updated.

• Scenario: Modify a NimbusPolicy

• Expected Outcome:

  • The NimbusPolicy reverts its changes.

• Similar test cases for a ClusterSecurityIntentBinding with corresponding ClusterNimbusPolicy update.

Delete

• Scenario: Delete a SecurityIntentBinding.

• Expected Outcome:

  • The corresponding NimbusPolicy is deleted.

• Similar test case for a ClusterSecurityIntentBinding with corresponding ClusterNimbusPolicy deletion.