[MD] Optimize text content and layout with UX inputs

[noCharger]

• [ ] 1. the content for delete button confirmation box

Use case 1 - This is the screenshot of delete button confirmation box in editing credential page:

Use case 2 - This is the screenshot of listing page delete button from Saved Object section, just want to confirm the design for credential listing page delete button confirmation box.

• [x] 2. list page columns to expose, and respective column names [Done]

• [ ] 3. toast message for success and error Context - Index pattern management page Context - Inside Saved object management page

• [ ] 4. Context of header See screen shots https://github.com/opensearch-project/OpenSearch-Dashboards/issues/2051