Use Patch request to update EventMesh subscriptions Webhook Auth in Eventing controller

[k15r]

Context:
Currently, whenever we have to update the eventMesh subscriptions, we delete and re-create the subscription on EventMesh server. Idea: we can use the PATCH request to update instead of deleting and re-creating!!!

Description
In order to update the client credentials used by event mesh we need to implement a PATCH request as documented here:
https://api.sap.com/api/SAPEventMeshDefaultCredentialsAPIs/resource/Webhook_Credentials_Management

Tasks:

• Update EventMesh mock to support PATCH requests.
• use the PATCH request to update instead of deleting and re-creating eventMesh subscriptions.
• Add integrations tests to verify.
• Decide if a test is needed at fast-integration level (added Create a new job to execute the eventing tests with the eventingWebhookAuth flag enabled #17797).

Acceptance

• We can update EventMesh subscription without deleting it.
• existing webhooks can be updated to use a new set of credentials

[mfaizanse]

Blocked!

We are using POST /events/subscriptions API and we want to provide the name of webhook-credentials which we created using these APIs, is it supported?

[mfaizanse]

Unblocked!

• Documentation for currently used API: POST /events/subscriptions

[mfaizanse]

Use these APIs to:

1. Pause the EventMesh subscription.
2. Update the Auth credentials.
3. Unpause the EventMesh subscription.

[marcobebway]

Blocked because the patch request returns the following error:

{
    "error": {
        "code": "INTERNAL_SERVER_ERROR",
        "message": "Error occurred in the system"
    }
}

[k15r]

To unblock this ticket, during implementation and test fall back to using a MOCK

[marcobebway]

Moving to blocked because the PATCH request is returning 5xx.

[marcobebway]

Moving to blocked because the PATCH request is caching the secret and is not sensitive to changes.