Issue Description: With completion of MGDOBR-990, especially with https://github.com/5733d9e2be6485d52ffa08870cabdee0/sandbox-ui/pull/182, we should add cypress test, that would verify 'endpoint' is refreshed automatically one 'smart event instance' is 'ready'.

Acceptance Criteria: New cypress test is created. Mocked environment is preferred over staging environment.

The test should contain at least two assertions.

• One assertion for a state, just after 'instance' was created and 'endpoint is not 'ready' yet
• Second assertion for a state, when 'instance' turned into 'ready' state and the 'endpoint' is available

Out of Scope: <Here you need to fill in what is out of scope for this issue and then create new issues if necessary in the backlog for the work>

Additional Information: <Add any additional information here that may be helpful to people reading the ticket>