Increase global test coverage to >99%

[github-actions[bot]]

Coverage after merging test-sprint into main will be

99.80%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
Auth.sol	100%	100%	100%	100%
CentrifugeRouter.sol	95.95%	58.33%	100%	99.07%	107, 107, 202, 202, 41, 48
ERC7540Vault.sol	100%	100%	100%	100%
Escrow.sol	100%	100%	100%	100%
InvestmentManager.sol	98.88%	100%	93.02%	100%
PoolManager.sol	98.67%	100%	88.89%	100%
Root.sol	98.48%	100%	92.86%	100%
src/admin
Guardian.sol	100%	100%	100%	100%
src/factories
ERC7540VaultFactory.sol	100%	100%	100%	100%
TrancheFactory.sol	100%	100%	100%	100%
TransferProxyFactory.sol	100%	100%	100%	100%
src/gateway
GasService.sol	100%	100%	100%	100%
Gateway.sol	99.07%	95.65%	100%	100%	221, 226
src/gateway/adapters/axelar
Adapter.sol	100%	100%	100%	100%
Forwarder.sol	100%	100%	100%	100%
src/token
ERC20.sol	100%	100%	100%	100%
RestrictionManager.sol	100%	100%	100%	100%
Tranche.sol	96.08%	100%	94.44%	96.55%	157