chore: add e2e tests for ArgoCD Agent

[jparsai]

This PR is to add ArgoCD Agent E2E tests in GitOps Operator. It has tests to verify Principal, Agent components in stand alone as well as connected mode. These tests are isolating principal, managed and autonomous agents in different namespaces to simulate multi cluster environment.

Here is how namespaces are used for principal/agent resource isolation to simulate hub and 2 spokes in same cluster.

Test Cluster (Has a Hub and two Spokes (Managed and Autonomous) simulated)
│
├─ 🏛️ Hub Cluster
│   ├─ Namespace: ns-hosting-principal
│   │   ├─ ArgoCD: argocd-hub (Principal enabled)
│   │   ├─ Deployment: argocd-hub-agent-principal
│   │   ├─ Service: argocd-hub-agent-principal (Type LoadBalancer)
│   │   ├─ Secrets: TLS, JWT, CA, Cluster registration secrets
│   │   └─ AppProject: agent-app-project ("Source of truth" for managed agent, delivered to agent by principal)
│   │
│   ├─ Namespace: managed-cluster-in-hub (Logical representation of managed cluster in hub)
│   │   └─ Application: app-managed ("Source of truth" for managed agent, delivered to agent by principal)
│   │
│   └─ Namespace: autonomous-cluster-in-hub (Logical representation of autonomous cluster in hub)
|       └─ Application: app-autonomous ("Source of truth" is autonomous agent, delivered to principal by agent)
│
├─ 🔵 Managed Spoke Cluster
│   ├─ Namespace: ns-hosting-managed-agent
│   │   ├─ ArgoCD: argocd-spoke (Agent enabled, Managed mode)
│   │   ├─ Deployment: argocd-spoke-agent-agent
│   │   ├─ Secrets: Client TLS, CA
|   |   └─ Application: app-managed ("Source of truth" is principal, but Reconciled and deployed in spoke by agent)
│   │
│   └─ Namespace: ns-hosting-app-in-managed-cluster
│       └─ Pod/Service/Route: spring-petclinic (Application resources deployed by agent in spoke)
│
└─ 🔵 Autonomous Spoke Cluster
    ├─ Namespace: ns-hosting-autonomous-agent
    │   ├─ ArgoCD: argocd-spoke (Agent enabled, Autonomous mode)
    │   ├─ Deployment: argocd-spoke-agent-agent
    │   ├─ Secrets: Client TLS, CA
    │   ├─ AppProject: agent-app-project ("Source of truth" is autonomous agent, delivered to principal by agent)
    │   └─ Application: app-autonomous ("Source of truth" is autonomous agent, delivered to principal by agent, Reconciled and deployed in spoke by agent)
    │
    └─ Namespace: ns-hosting-app-in-autonomous-cluster
        └─ Pod/Service/Route: spring-petclinic (Application resources deployed by agent in spoke)

/kind enhancement

Assisted by: Cursor

[openshift-ci]

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