Rb/truffle to foundry

[RiccardoBiosas]

What does this pull request do? Explain your changes. (required) Since the protocol repo has been gradually adopting Foundry to run Solidity-based tests - which provides a better alternative to Truffle-, the PR refactors the current truffle-based Solidity tests so that they can be run as part of the Foundry codebase.

Specific updates (required)

• Moved the Solidity tests to the Foundry directory and refactored them accordingly
• Removed the runSolidityTest helper
• Removed all the truffle-based Solidity helpers and moved the RevertProxy helper to the Foundry directory

How did you test each of these updates (required) Successfully run yarn test and forge test -v --match-contract Test to test all the new foundry-based unit tests

Does this pull request close any open issues? https://github.com/livepeer/protocol/issues/576

Checklist:

• [ ] README and other documentation updated
• [x] All tests using yarn test pass

[coveralls]

Pull Request Test Coverage Report for Build 2663238582

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-2.0%) to 97.399%

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Files with Coverage Reduction	New Missed Lines	%
contracts/libraries/MathUtils.sol	2	50.0%
contracts/libraries/PreciseMathUtils.sol	2	50.0%
contracts/libraries/SortedDoublyLL.sol	6	87.14%
<!--	Total:	10		-->

Totals
Change from base Build 2556706908:	-2.0%
Covered Lines:	768
Relevant Lines:	781

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💛 - Coveralls

[RiccardoBiosas]

Ah actually it would be great to add additional tests for the reduced coverage - https://coveralls.io/builds/50828602 Should be small only

The only reason why the coverage dropped is because the package solidity-coverage is not currently taking into account the foundry tests - unlike the previous truffle-based tests run via runSolidityTest.js. Foundry has recently added a coverage feature in one of its latest 2.x releases but we cannot upgrade to it right away due to this issue in the way foundry 2.x handles L2 networks: once the issue will be addressed I think we can fix the 'fake' coverage drop.