Improve Unit Test Coverage for Smart Contracts

[LyonSsS]

Based on https://app.zenhub.com/workspaces/sygma-qa-655233316c6d7b210574d005/issues/zh/12 we identified some new scenarios that can be added to the Solidity Unit tests to improve coverage.

Bridge

• Fail to be paused Bridge by non admin
• Fail to be unpaused by non admin
• Fail to trigger KeyRefresh by admin with incorrect hash
• Fail to setResource by non Admin
• Replace Unit tests for PermissionedGenericMessage with PermisionlessGenericMessage ones
• Fail to Withdraw as NonAdmin
• Pause Bridge and try some actions like Deposit, Execute Proposal, Withdraw, which should fail.
• Change Admin AcessControl and try to use Admin functions with the new Admin AND to fail with
  the old Admin

ERC20

• Deposit with an incorrect resource ID ( notmapped to the handler) should be reverted
• Deposit to an unmapped dest domain ID should be reverted

Generic

• Deposit Genric with an incorrect resource ID ( notmapped to the handler) should be reverted
• Deposit generic to an unmapped dest domain ID should be reverted

Execute Proposals

• Extend test to GMP execution also

PercentageFeeHandler

• Set whitelist
• Unset whitelist
• Check to not take fee for whitelist
• Check to fail if not adding fee and for non Whitelisted
• Check to not take fee, if fee added & Whitelisted
• Check to request Fee if it was set from Whitelisted to NonWhitelisted