[Internal]: [ResponseOps] Support Oauth 2.0 authentication on webhook connector

[tiamliu]

Description

What: Oauth 2.0 authentication compatibility on Kibana webhook connector
When: stack release 9.2
Why: support an industry standard authentication framework.

Docs impact:

• First screenshot on the Webhook connector and action page is outdated.
• Need to add an item for the new OAuth 2.0 Client Credentials option, which has the following config fields:

Resources

Epic: elastic/kibana#216140
PR: elastic/kibana#218442

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

this feature is identical in all deployments

What release is this request related to?

9.2

Serverless release

9.2

Collaboration model

The documentation team

Point of contact.

Main contact: @jcger

Stakeholders: @tiamliu

[nastasha-solomon]

Serverless and 9.2 docs merged.