Description of problem:
When creating new Data providers using Data Provider Manager panel, it is possible to create 2 or more panels, that have the same name (see attached screenshot)

Version-Release number of selected component (if applicable):

How reproducible:
Always

Steps to Reproduce:
1. Navigate to workspace "Showcase", page "Data providers"
2. Create 2 new data providers, that have the same value in the "Name" field.

Actual results:
The providers with the same name are created successfully.

Expected results:
Input validation should be performed when user clicks on "Save" after filling in parameters of new data provider. For example an error message like "This name is already used" or "Data provider with this name already exists" should be displayed.

Since the choice of the data provider name is entirely up to user, he should be prevented to enter the same name for a new data provider as the name of some already configured Data provider. Because later, when he chooses which data provider he should choose for some KPI panel, or when he wants to delete some panel, it will not be clear to him which provider is which.