Feat/202 operation emission summary page

[acatchpole]

Card: bcgov/cas-reporting#202

The main difference between this page and the existing facility emission summary is that the facility summary uses the
facility_report to aggregate emissions. The operation emission summary uses the report_version to sum up emissions. Doing this captures emissions across the entire operation, rather than just one facility.

To test locally:

1. navigate to the BCIERS dashboard at http://localhost:3000/dashboard
2. ensure you are logged in
3. click on 'Submit annual reports(s)'
4. click on 'Continue' next to Operation 3
5. progress through the forms, filling out any needed fields before hitting 'Save & Continue'
6. Ensure that emission data is added on at least one activity form.
7. Continue to progress to the Emission Summary page.
8. Take note of the populated fields
9. go to the URL http://localhost:3000/reporting/reports/2/emission-summary
   • expect to see the fields on this page are populated identically to the previous emission summary page

[pbastia]

This is really good! 🎉
I've left a few comments on where we can improve code re-use and reduce the amounts of database calls. Let me know if you have any questions, happy to pair on any of these items!