Removed unit tests from test action

Because we otherwise have to set up:
1. brownie
2. brownie pm install...
3. ganache-cli (via `npm install ganache-cli`)

It's a bit heavy. Easier to run manually for now.

.github/workflows/test.yml

@@ -22,5 +22,3 @@ jobs:
         run: pip install -e .[dev]
       - name: Black syntax check
         run: black --check dao/
-      - name: Run unit tests
-        run: sh test.sh