Unit tests

[han-so1omon]

What needs to be done

Run unit tests on pull request to master

Why it needs to be done

Unit tests are not being run, and as a result we see too many bugs in production

Acceptance Criteria

• When a pull request is submitted to master, a Github Action is triggered to run the unit tests, where all unit tests must pass to yield Success
• Unit tests show 70% code coverage or above on the CPFTreasury, CPSCore, and CPSTreasury contracts. If necessary, update existing unit tests to do so
• Unit tests show 70% code coverage or above on React components in the Frontend directory. If necessary, update existing unit tests to do so