Remediation of an applicationgroup on installation failure does not remove the application namespaces

**Describe the bug**
If an ApplicationGroup were to fail on install, and the reversal workflow cleansup all HelmReleases, the Application namespaces are not deleted until the ApplicationGroup itself is manually deleted.

**To Reproduce**
Steps to reproduce the behavior:
1. Create ApplicationGroup bookinfo
2. Let it succeed
3. Delete ApplicationGroup bookinfo
4. Immediately recreate the same ApplicationGroup bookinfo (this should induce a reconciliation failure since the Application Namespaces already exists)

**Expected behavior**
Namespaces should be removed during cleanup

**Screenshots**
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**Environment (please complete the following information):**
- Kubernetes Version [e.g. 1.21.0]: **1.20.0**
- Kubernetes Distro [e.g. AKS, GKE, etc.]: **Kind**
- Orkestra Version Tag: **`latest`**
- Helm Version: **v3.2.4**

**Additional context**
Add any other context about the problem here.