AppProject in ArgoCD is seen as an orphaned resource

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Checklist:

* [x] I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
* [x] I've included steps to reproduce the bug.
* [x] I've pasted the output of `argocd version`.

**Describe the bug**

Argo self managed resources appear as orphaned

**To Reproduce**

1. Enable display of orphaned resources
2. Add some ignore items for them
```
ignore:
- kind: ResourceQuota
- kind: Secret
name: sh.helm.release.v1.*
- kind: Secret
name: '*-tls'
```
3. Go to the argocd application itself
4. Show orphaned resources
5. See `Application - applications` and `AppProject - default`

**Expected behavior**

A clear and concise description of what you expected to happen.

**Screenshots**


**Version**

```shell
{
"Version": "v1.8.1+c2547dc",
"BuildDate": "2020-12-10T02:59:21Z",
"GitCommit": "c2547dca95437fdbb4d1e984b0592e6b9110d37f",
"GitTreeState": "clean",
"GoVersion": "go1.14.12",
"Compiler": "gc",
"Platform": "linux/amd64",
"KsonnetVersion": "v0.13.1",
"KustomizeVersion": "v3.8.1 2020-07-16T00:58:46Z",
"HelmVersion": "v3.4.1+gc4e7485",
"KubectlVersion": "v1.17.8",
"JsonnetVersion": "v0.17.0"
}
```

**Logs**

```
Paste any relevant application logs here.
```

Start by reproducing the report with orphaned-resource display enabled and the listed ResourceQuota and Secret ignore rules, then inspect how the Argo CD application handles its Application and AppProject resources. Done means those self-managed resources are no longer shown as orphaned while unrelated orphaned resources remain visible.

Written by the indexing model from the issue text.