Add validation for OAuth Server Name

[JuricDavor]

[Add validation for OAuth Server Name. if you add a name of a server which already exist you are able to save that changes. Although the server is not created you are receiving a popup with a success message ]

Reproduction Steps:

1. [Log in > Navigate to OAuth Servers]
2. [Create a new OAuth Servers]
3. [Fill OAuth Server Name input field which already exist ]

User should not be able to save changes. Error message should appear in a popup that this Server Name already exist:

[Describe expected behavior here]

When clicking on Create a OAuth Server popup appears with the successful message. Although the actual server is not created we should not show popup with successful message.

[ivanzusko]

Thank you, @JuricDavor !

[ivanzusko]

@rafaeljesus , Senior, por favor, can you check this out? Seems like when we are creating the new item with the same name - it's merging to elements into one...

[s4nji]

@ivanzusko the issue you mentioned has been fixed 🙂

[ivanzusko]

Awesome! 🎉