Implement skeleton text for loading data

[Dhiraj1405]

Issue Description

Loading times can lead to a less than optimal user experience when waiting for content to load. To improve user perception of loading times, we should implement a skeleton text UI pattern that provides a visual indication of content loading in place of actual data.

Apps Checklist

• [ ] Job Manager
• [ ] Pre-order management

[k2maan]

Figured out a way to implement the skeleton loading part of the solution through directives. More handling on the template level will be done later.