Ease out updating of test exchange_rates when ERI or new test cases are added

[ivendor]

When introducing new ERI values or new broker test case are added we have to now manually append entries into exchange rates. To workaround this problem, I've forked the test mode in 2 test modes:

• TEST MODE when the pytest is run outside of pre-commit hook which auto append entries to the test mocks supporting parallel execution of tests via file locks
• TEST STRICT MODE when the pytest is run inside the pre-commit hook which beahves like TEST MODE before this change.

Finally regenerated the CSV file using TEST MODE