[BUG] Can create multiple Data Source using the same Data Source Name through API

[zhyuanqi]

Describe the bug

Can create multiple Data Source using the same Data Source Name through API.
Then we can have a few datasource with the same name

To Reproduce
Steps to reproduce the behavior:

1. Create data source use API. In our case, we use cy.request.

cy.request({
  method: "POST",
  url: `${BASE_PATH}/api/saved_objects/data-source`,
  headers: {
      osd-xsrf": true,
  },
  body: {
      attributes: {
         title: "testDataSource",
        endpoint: Cypress.env("dataSourceEndpoint"),
        auth: {
            type: "token_exchange",
            credentials: {
                region: Cypress.env("dataSourceRegion"),
                roleARN: Cypress.env("dataSourceRoleArn"),
                service: getDataSourceServiceName(),
            },
       },
    },
},

2. We can create several dataSource with the same name

3. You will see odd behavior in selector as well.

Expected behavior
The API behavior should be consistent as UI behavior. The datasource cannot have the same name

OpenSearch Version
OS_2.13

Dashboards Version
OS_2.13

Plugins

Please list all plugins currently enabled.

Screenshots

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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Browser and version [e.g. 22]

Additional context

Add any other context about the problem here.

[BionIT]

Hi @zhyuanqi, are you working on this issue and should it be done for 2.15 ?