fix: updated to openapi 3, modified user delete endpoint

Type of change

• Bug Fix
• Feature
• Pipeline
• Test

Does this introduce a change in the core logic?

• No
• Yes

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Does this follow conventional commits spec?

• [] No
• Yes

Have you set the target Milestone?

• [] No
• Yes

Have you set the no-detached-pipeline label?

• [] No
• Yes

Updates description?

In order to update from swagger 2.0 to 3.0 I had to modify DELETE user endpoint because parameters were passed in body instead of query. With that modification done, swagger is updated.