[BUG] Cluster endpoint URL pattern validation for Server and Serverless domain in UX component before sending test connection request (Optional)

[xinruiba]

Describe the bug

When we try to create a datasource from "Dashboards Management" ---> "Data Sources" ---> "Create DataSource", we notice we if the datasource endpoint is start with "http" or "https", it will pass the endpoint validation.

Create this bug to:

1. Check if there are more detailed endpoint validation we can do from front-end side.

To Reproduce
Steps to reproduce the behavior:

1. Go to "Dashboards Management" ---> "Data Sources"
2. Click on "Create data source connection"
3. Fill in the form with DataSource Title. eg: "test"
4. Fill in the form with DataSource Endpoint followed with a path name. eg: "https://opensearchendpoint/_dashboard"
5. You will notice every endpoint start with "http" and "https" will be passed the validation

Expected behavior
Take a investigation to see if there are more endpoint format validations we can do.

In scope
This change should only in front-end side including following staff:

1. Work with team and ux to figure out the expected endpoint pattern
2. Endpoint pattern validation code change

Out of scope

1. Endpoint correctness suggestions

Expected output

Detect endpoint format error inputed by our customer