test: Allow individual application tiles to be selectable

[keithchong]

Summary

We need to add unique class values in order to use selectors to identify each application tile so that the UI test tool can uniquely identify each app easily, and perform actions on them.

Motivation

As it stands, it's likely not possible to uniquely identify each app.

Proposal

Add some unique test-specific identifier to the class attribute.

This is in addition to the changes made in to #4393 where we added test specific id attributes. With this, we will better handle more than one app in the application list view.

[keithchong]

Hi @alexmt , please assign this to me.

[keithchong]

The PR has been created. Here is a short demo selenium test script in action to take advantage of this change. It launches the ArgoCD Ui where 4 apps already exist. It clicks on the Delete button on the sockshop app. (Note, there are 4 app delete buttons in the tiles view). The confirmation window appears to confirm that the delete button has been pressed.

4841-ClickDeleteButtonOnAppTile.zip