Adapted tests to work for Mainnet fork

[sajanrajdev]

Adapted all tests to work for mainnet fork (previously eBTC tests were pointing at Sepolia addresses). Flattened mock contracts were added to the project and deployed within the fixtures, asset funding introduced from mainnet setup. Only a small logic adjustment introduced to the close_cdp function on the balance check (statndardized checks in terms of shares).

Run tests with:

brownie test

Results:

[petrovska-petro]

tests are passing smoothly ✅

• converts to shares units the assertion after closing a cdp
• introduces mocks deployed in the suite to test primary and secondary oracles in gov suite
• modifies force deposits w/ real coll creation via submit