feat: Add radio boxes for the two flows in create index modal CLOUDP-311780

[rubydong]

Description

https://jira.mongodb.org/browse/CLOUDP-311780

Added radio boxes for the two flows and content will be different based on which one is clicked

Control:

Variant:
Index Flow

Query Flow

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• If this change updates the UI, screenshots/videos are added and a design review is requested
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)