chore: Further ZKsync OS cleanup

[0xValera]

What ❔

Some ZKsync OS cleanup was still in a TODO state after we were done with everything interop-related.
Now we resolve all of the other issues in this PR.

Why ❔

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.

[github-actions]

Coverage after merging vg/zksync-os-comp-cleanup into draft-v30 will be

80.23%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts/bridge
BridgeHelper.sol	85.71%	100%	100%	85%	31, 36, 41
BridgedStandardERC20.sol	82.14%	100%	92.31%	80.28%	120–121, 126–127, 139–140, 164, 205, 212, 219, 229–230, 63, 91
L1ERC20Bridge.sol	94%	100%	100%	93.02%	189, 208, 270
L1Nullifier.sol	83.33%	100%	86.21%	82.89%	115, 129–131, 161, 222, 225, 235, 238, 248, 251, 419–421, 425–426, 453, 519, 603, 615, 653, 655, 699, 711, 714, 716, 729, 742–743, 747–748, 768
contracts/bridge/asset-router
AssetRouterBase.sol	97.14%	100%	100%	96.55%	67
L1AssetRouter.sol	88.17%	100%	89.29%	87.97%	106, 232, 270, 286, 373, 384, 415, 454–455, 469, 500, 572, 661, 672, 686, 691, 74, 90, 98
contracts/bridge/interfaces
AssetHandlerModifiers.sol	75%	100%	100%	66.67%	13
contracts/bridge/ntv
L1NativeTokenVault.sol	86.72%	100%	90.48%	85.98%	172–178, 180, 248–249, 251, 262, 264, 270, 94
NativeTokenVaultBase.sol	89.08%	100%	91.67%	88.67%	106, 238, 243, 260, 278, 283, 299, 318, 326, 495, 510, 538, 571–572, 576–577, 90
UpgradeableBeaconDeployer.sol	0%	100%	0%	0%	15–16, 18, 20–21
contracts/bridgehub
BridgehubBase.sol	80.48%	100%	83.78%	79.77%	137, 145, 150–152, 159, 177, 217–218, 227, 242, 281, 284, 303, 319, 350, 388–389, 484, 488, 492–493, 512, 515, 571, 575, 578, 613–614, 618–619, 627–628, 632–633
CTMDeploymentTracker.sol	73.47%	100%	81.82%	71.05%	107, 111, 115, 140, 144–145, 33, 41, 66, 79–80
ChainAssetHandlerBase.sol	72.88%	100%	75%	72.55%	131, 148, 151, 163–164, 209, 259–260, 264–265, 83, 90–91, 99
L1Bridgehub.sol	87.70%	100%	92.86%	87.04%	100–101, 110, 120, 135, 252, 325, 329–330, 333, 65–66, 86, 96
L1ChainAssetHandler.sol	77.78%	100%	71.43%	80%	35–36, 44–45
L1MessageRoot.sol	78.57%	100%	75%	80%	36–37
L2Bridgehub.sol	80.56%	100%	75%	82.14%	108, 65, 81–82, 93
L2ChainAssetHandler.sol	80.65%	100%	75%	82.61%	47–48, 70, 94
L2MessageRoot.sol	34.38%	100%	50%	30.77%	39–40, 43–44, 50, 68, 74–75, 79, 81, 83, 86–87, 89, 93–96
L2MessageVerification.sol	100%	100%	100%	100%
MessageRootBase.sol	56.14%	100%	63.64%	54.35%	107–109, 115–117, 126, 132, 144, 154, 159–164, 166–170
contracts/common
ReentrancyGuard.sol	95%	100%	100%	94.12%	79
contracts/common/l2-helpers
L2ContractHelper.sol	84.91%	100%	100%	82.22%	102, 108, 112, 129, 134, 73, 79, 83
SystemContractsCaller.sol	0%	100%	0%	0%	102, 114, 122–125, 128, 135–139, 141–142, 32–34, 37, 44–45, 47, 49, 51, 53, 66, 69, 72, 75, 78, 83, 89, 91, 93, 96, 98
contracts/common/libraries
DataEncoding.sol	85.11%	100%	100%	81.58%	109–110, 117–118, 163, 177, 45
DynamicIncrementalMerkle.sol	73.91%	100%	80%	73.17%	66–70, 72–74, 76–78
FullMerkle.sol	100%	100%	100%	100%
Merkle.sol	98.15%	100%	100%	97.96%	83
MessageHashing.sol	95.16%	100%	100%	94.64%	113, 77, 94
SemVer.sol	100%	100%	100%	100%
UncheckedMath.sol	100%	100%	100%	100%
UnsafeBytes.sol	100%	100%	100%	100%
contracts/governance
AccessControlRestriction.sol	100%	100%	100%	100%
ChainAdmin.sol	97.87%	100%	100%	97.30%	39
ChainAdminOwnable.sol	44.83%	100%	40%	45.83%	28, 38–40, 46–48, 57, 66, 77–79, 81
Governance.sol	100%	100%	100%	100%
L2ProxyAdminDeployer.sol	0%	100%	0%	0%	16–18, 20
PermanentRestriction.sol	88.80%	100%	100%	87.39%	104, 111–112, 200–201, 204–205, 208, 210–211, 240, 288, 310, 341
ServerNotifier.sol	93.10%	100%	100%	90.91%	55, 65
TransitionaryOwner.sol	0%	100%	0%	0%	16–17, 21–23
contracts/governance/restriction
Restriction.sol	100%	100%	100%	100%
RestrictionValidator.sol	100%	100%	100%	100%
contracts/l2-upgrades
L2ComplexUpgrader.sol	0%	100%	0%	0%	23, 25–26, 40, 45, 47, 57, 63–64, 71, 80–82, 85, 87–88
L2GenesisForceDeploymentsHelper.sol	0%	100%	0%	0%	100, 107–108, 111–113, 119, 127, 131, 136, 138, 148, 157, 160, 165, 175, 177–178, 181, 184, 190, 194, 198, 209, 218, 223, 225, 233, 244, 258, 264, 284, 292–293, 296–297, 299, 306, 312, 33–36, 44, 47–48, 53, 59–61, 69–71, 73, 83, 91, 95
L2GenesisUpgrade.sol	0%	100%	0%	0%	24, 31–32, 37–38, 42, 50
contracts/state-transition
AccessControlEnumerablePerChainAddressUpgradeable.sol	98.15%	100%	100%	97.67%	179
ChainTypeManager.sol	85.93%	100%	84.62%	86.25%	111, 123, 129, 137–138, 245–248, 261–264, 279, 409, 471, 499, 506, 533, 581,