euc-monitoring.json.template - missing Storefront service checks

[schwartzmiller]

Storefront section was missing the services to check which the Grafana dashboards were referencing.

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Storefront section was missing the services to check which the Grafana dashboards were referencing. Added the noted services.

This PR fixes/implements the following bugs/features

• [X] Bug 1
• [ ] Bug 2
• [ ] Feature 1
• [ ] Feature 2
• [ ] Breaking changes

Explain the motivation for making this change. What existing problem does the pull request solve?

Does the code pass AppVeyor?

• [x] Yes

Closing issues

Fixes #