Secure the secrets in Action Management component

[ashanthamara]

Describe the Issue:

With the introduction of the new Action Management component, we are storing the secrets of the external endpoints in our system.
Since we have a Saas offering it's a must to ensure that the secrets are properly encrypted before adding them to the database which is also comes as a requirement in the SOC compliance.

So we need to improve the action-mgt component to store the secrets using the secret-mgt component.

Sub Task Issue for: #20747

[ashanthamara]

Related PRs:

• Integrate secret management to action-mgt component carbon-identity-framework#5795
• Integrate secret-management to action-management component identity-api-server#630
• Update integration tests of action-mgt rest api. #20706

[ashanthamara]

Change PATCH endpoint to update the full action including minor bug fixes:

• Improve PATCH endpoint to update the full Action in action-mgt component carbon-identity-framework#5808
• Improve PATCH endpoint to update the full Action in action-management identity-api-server#635
• Modify integration tests of Action Mgt Rest API #20736

[ashanthamara]

Closing this issue and track the progress through #20748