* github workflow to generate and validate openapi spec
* updated github workflow name to remove spaces and be more explicit
* added swagger-cli globally to reduce dep installation times
* removed redundant webhook payload in GET request
* fixed edgeGroupList OAS3 response model
* updated CI pipeline to convert OAS2 to OAS3 and validate OAS3 instead
* updated pipeline name to be more explicit
* removed redundant swagger-cli dependency as we are using swagger2openapi only in github CI
* fixed bug with no validation - using swagger-cli to validate
