fix: Remove feature flag from onboarding extension request features.

[pankajjs]

Issue Description

Currently, all features for onboarding extension request are behind feature flag.
The features include -

• Create onboarding extension API POST /requests
• Edit onboarding extension API PATCH /requests/:id
• Approve/Reject onboarding extension API PUT /requests/:id
• Discord command to create the request /onboarding-extension

Expected Behaviour

User should be able to access the features without feature flag.

Current Behaviour

All mentioned features are behind feature flag.

Reproducibility

• This issue is reproducible
• This issue is not reproducible

Severity/Priority

• Critical
• High
• Medium
• Low

Checklist

• I have read and followed the project's code of conduct.
• I have searched for similar issues before creating this one.
• I have provided all the necessary information to understand and reproduce the issue.
• I am willing to contribute to the resolution of this issue.