[$15] Include count of open jobs in jobs list

[wdprice]

Include a county of the num of openings and how many have been filled within the job list UI:

[wdprice]

FYI @SathyaJayabal - logged this for a future release.

[maxceem]

Sum up:

• Each job has numPositions field which should be shown as 2 open positions
• We should count how many resources are associated with this job. And if there are more than 0 of them, then show their number as 1 / 2 open positions.
• Create some reusable method to format this string, like we do for many other cases, see https://github.com/topcoder-platform/taas-app/blob/dev/src/utils/format.js
• See screenshot for example for this Team https://platform.topcoder-dev.com/taas/myteams/16805 jobId e7c3dcd2-4032-4426-9c72-ab0f6a68779d. Note, that in this case there are 3 resources, so it should show: 3 / 2 open positions

[maxceem]

Challenge https://www.topcoder.com/challenges/b362cd7f-7a5b-4566-b60c-71b2feae5557 has been created for this ticket.

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[yoution]

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[maxceem]

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