add parameters with institution url values to be used in Caliper event queries

[zqian]

Thank you for contributing to this project!

Describe your problem or feature you'd like added

The env_sample.json file currently contains umich-specific url values in multiple queries inside "RESOURCE_ACCESS_CONFIG" element, e.g.

ed_app.id IN UNNEST(['http://m.canvas.umich.edu/', 'http://umich.instructure.com/'])

We need to parametrize those values to be used in multiple cron queries

[zqian]

I now think it is not worth the effort to make those values configurable. It is OK to leave those values (with 'umich' string inside) as a placeholder, and also as a hint for proper formats.

I suggest we close this ticket as "not needed".