feat: Add cli support for some new preview urls

[sselvam7]

Fixes

Add cli support for some new preview urls from Flex. Also a fix for a null check.

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket, or create a GitHub Issue in this repository.

[tiwarishubham635]

Please create a branch in this repo and add your changes there so that it can access the sonar token secret of this repo.

[tiwarishubham635]

This file need not be changed since these spec files will be overwritten by released spec files from oai. If your changes are there in open-api or api-definitions, they will be coming here as well. No need to do it explicitly here.