Update the test examples to fix date error in spreadsheet

[jkwan2011]

There is an error in the spreadsheet where some examples (e.g., quateman) produce a 1-day gap between the start date of a billing period and the previous billing period's end date. When this is fixed in the spreadsheet, we will need to update all examples (inputs and assertions) that were affected by this error.

[alanisaac]

See for example, the difference between start and end dates for each record between:

• The original CSV from National Grid: https://github.com/codeforboston/home-energy-analysis-tool/blob/main/rules-engine/tests/test_rules_engine/cases/examples/quateman/natural-gas-national-grid.csv
• The CSV produced from the example: https://github.com/codeforboston/home-energy-analysis-tool/blob/main/rules-engine/tests/test_rules_engine/cases/examples/quateman/natural-gas.csv

Ideally, these dates should line up so we can use these same test cases to test the CSV parser.

[ethanstrominger]

• created a copy of the source spreadsheet and put here.
• adjusted formula in column D of ngma_gas_billing_data_Service 1 sheet to add 1
• updated summary.json to reflect changes in summary tab
• exported natural gas sheet to csv
• updated csv in quateman folder
• ran tests
• based on results, changed estimated balance point from 51.5 to 52 in spreadsheet. With changes to data, this is a more accurate estimated balance point.
• exported natural gas sheet to csv
• updated csv in quateman folder
• reran tests. Everything passed.