Fleet: Show clusters applicable to a git repo

[richard-cox]

Detailed Description

• When a git repo is created and it doesn't apply to any clusters the detail page can show misleading information
  • Number of 'ready' resources yet no actual resources
• On the git repo detail page we should list clusters that the repo applies to
  • Discussion: We should also maybe show a warning somewhere when a repo doesn't apply to any?

Context

• See https://rancher-users.slack.com/archives/C013SSBKB6U/p1642328781051100 conversation for source

[nwmac]

(See clusters ready column)

[nwmac]

Currently looks like this when you target a group that does not have any matching clusters:

Task is to update the 'Clusters Ready' column so that when it is a Group, it shows the number of clusters in the group as well - e.g. 0/0 - when the number in the group is 0, it also shows a waring icon with a hover tooltip 'There are no clusters in this Cluster Group'

[davidnuzik]

My checks PASSED

Reproduction Steps:

Not required. Issue is well understood and reproduced recently. Before the change the total clusters ready was not show and there was no ! icon showing an issue.

---

Validation Environment:

Rancher version: v2.6-head `` pulled on 2/24/2022
Rancher cluster type: single-node docker install
Docker version: 20.10

Downstream cluster type: RKE2
Downstream K8s version: v1.21.9+rke2r1

Validation steps:

1. Create a GitRepo on the Continuous Delivery page (left nav bar). I just used fleet-examples (https://github.com/rancher/fleet-examples.git is the Repo URL) and set the path to /single-cluster/helm. In the dropdown for "Deploy To", pick "No Clusters". Submit.
2. Notice the new changes as pictured below. We now see the total count of clusters targeted. We also see a warning icon when deploys to zero clusters (none targeted). This is basically the change (see the PR for details).

[jtravee]

Confirmed with @catherineluse and @gaktive to add release note label.