refactor: TokenVoting and TokenVotingSetup tests

[heueristik]

This PR refactors the

• unit tests of TokenVoting and TokenVotingSetup
• setup processing and upgradeability tests
• removes redundant files

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
src/	98.26	94.79	97.22	98.88
IMajorityVoting.sol	100	100	100	100
MajorityVotingBase.sol	96.15	92.5	95.45	97.22	323,331
TokenVoting.sol	100	97.5	100	100
TokenVotingSetup.sol	100	93.75	100	100
src/ERC20/	100	100	100	100
IERC20MintableUpgradeable.sol	100	100	100	100
src/ERC20/governance/	100	100	100	100
GovernanceERC20.sol	100	100	100	100
GovernanceWrappedERC20.sol	100	100	100	100
IGovernanceWrappedERC20.sol	100	100	100	100
All files	98.57	96.09	98	99.03

Task ID: OS-1121

[novaknole]

I haven't gone through the whole PR. Only reviewed this unit test of token-voting. I want to first get opinions and whether it makes sense for me to continue reviewing.

• The token-voting unit test file is super big.
• It's really not unit testing because it uses dao and tokens and doesn't mock calls. So not sure why we call it unit test at all.
• I noticed the tendency that most of the tests retests things again and again, which clearly makes the file increase. The 3500 line for token-voting in my opinion is still huge and unmanageable. See my half-review on the PR.

I added my reviews, but stopped in the middle because none of you might agree with me, so I might be reviewing such details for no reason. As for the security thing, at first glance, it's testing all flows, but it took me quite some time to understand the token voting and not sure whether it's worth it to re-learn it at this point.

[jordaniza]

This looked like a lot of work. Thank you for getting it done.

[clauBv23]

let some minor comments

[clauBv23]

LGTM!