Enable webhook feature in onprem

[Sachin-Mamoru]

Description

For the onprem enable the webhooks by default

Please select the area issue is related to

Identity Server Core

Version

7.2.0

Developer Checklist

• [Behavioural Change] Does this change introduce a behavioral change to the product?
•  ↳ Approved by team lead
•  ↳ Label impact/behavioral-change added
• [Migration Impact] Does this change have a migration impact?
•  ↳ Migration label added (e.g., 7.2.0-migration)
•  ↳ Migration issues created and linked
• [New Configuration] Does this change introduce a new configuration?
•  ↳ Label config added
•  ↳ Configuration is properly documented

[Sachin-Mamoru]

PR - wso2/carbon-identity-framework#7001