Job template enhancement - pipeline usage

[sagar1312]

What happened:
The template detail view in the UI currently shows below metrics for each version

• how many distinct jobs have been using the template
• how many builds have been executed for jobs using the template

Template owners do not have visibility into which jobs/pipelines are using their templates.

What you expected to happen:
We need insight in to how many distinct pipelines have one or more jobs using the template.
Also we need a tabular view showing the details of all the pipelines relying on specific version of a template.
This would help the template owners to analyze the usage and take necessary actions
Ex: Reach out to the pipeline owners to upgrade to more stable/latest versions and remove older versions of the template

How to reproduce it:
N/A

[ibu1224]

@sagar1312 @tkyi @jithine
Is it possible to insert a load indicator while the template usage list screen is loading?

Especially for templates that are used in a large number of pipelines, it takes time to fetch the data. During this time, the page goes blank, which degrades the user experience.

[jithine]

@ibu1224 can you create an issue for loading ? Let's track separately fro this.