Fix: 'app' label is overwritten by commonLabels for kubecost metrics …

[mortenmj]

What does this PR change?

This fixes a duplicate "app" label in the kubecost-agent Deployment

Does this PR rely on any other PRs?

No

How does this PR impact users? (This is the kind of thing that goes in release notes!)

No impact

Links to Issues or ZD tickets this PR addresses or fixes

• Key duplication in kubecost-metrics-deployment-template.yaml #1322

How was this PR tested?

Diffed the result between the chart in develop and in this branch:

➜ ~ diff -u original.yaml updated.yaml
--- original.yaml 2022-03-22 16:40:01.622002841 +0100
+++ updated.yaml 2022-03-22 16:40:15.382002845 +0100
@@ -18177,11 +18177,10 @@
name: kubecost-agent
labels:

- app.kubernetes.io/name: cost-analyzer
- helm.sh/chart: cost-analyzer-1.91.0
app.kubernetes.io/instance: kubecost
app.kubernetes.io/managed-by: Helm
- app: cost-analyzer
+ app.kubernetes.io/name: cost-analyzer
+ helm.sh/chart: cost-analyzer-1.91.0
app: kubecost-agent
spec:
replicas: 1

[nealormsbee]

Looks good to me. The changes follow the same procedure as was used to remove duplicate labels in #1299

Thanks for the submission!