[BUG] Trace analytics should show default data source instead of local cluster when page opens

[BionIT]

What is the bug?
Trace analytics support multi data sources feature in 2.14, and based on requirement, the default option when the page opens while there is no input from user/url, should be the default data source, but instead, the page shows local cluster

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Go to https://future.playground.opensearch.org/app/observability-traces#/
2. See option is local cluster

What is the expected behavior?
The default data source should be the option selected.

What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?

Do you have any additional context?
Add any other context about the problem.