Update Status pages to handle changes from removing nomad

[davidsmejia]

We need to handle the changed attribute names like nomad_pending_jobs in:

• the placeholder src/apiData.json
• src/pages/ExecDashboard/AppRunningSpeed.js
• src/pages/Dashboard/Index.js

And also remove the now extraneous code for getRunningJobs

[wvauclain]

One question that I have is what we want the Dashboard to look like when we are running the API locally (not in AWS). Right now, the API doesn't add any batch data when not running in the cloud, but depending on how the dashboard is written this might cause problems.

[kurtwheeler]

I don't think the dashboard is particularly useful if we're running the API locally as there's no Batch for it to pull stats from.