feat(argocd): add support for fetching an application by app name

[karthikjeeyar]

Fixes:

https://issues.redhat.com/browse/RHTAP-2849

Description:

Add support to fetch only the application thats matches the name defined in argocd/app-name annotation.

How to test

1. Add a Gitops Application in a namespace
2. Use the following annotation to fetch that single application in Argo CD plugin

        metadata:
            annotations:
               ....
               argocd/app-name: quarkus-app

Screenshots

cc: @rohitkrai03

[openshift-ci]

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[Eswaraiahsapram]

/lgtm

[rohitkrai03]

/approve

[sonarcloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[Eswaraiahsapram]

/lgtm