chore: remove test bloat

[jackchuma]

Summary

• Removes unused test/support surface: Kontrol proofs/scripts/profile, Slither config/db, solhint config, Blueprint library/tests, BenchmarkTest, MIPS64 test, CommonTest, MockERC20, SimpleStorage, MockSystemConfig, MockReceiver, ByteUtils, DisputeGames, and most invariant-only test files.
• Consolidates nested and double-nested multisig coverage into test/universal/MultisigScript.t.sol and inlines the MockReceiver fixture into test/utils/CBMulticall.t.sol.
• Moves deploy assertions from test/setup/StandardSystemAssertions.sol to test/deploy/SystemDeployAssertions.sol, renames the expected-state struct, and removes unused override plumbing.
• Keeps targeted coverage by adding a Jovian L1Block gas benchmark, a versioned nonce round-trip fuzz test, and additional SystemConfig gas-limit assertions.
• Removes Kontrol, Slither, and Solhint wiring from project config, dependency setup, ignore patterns, and validation exclusions.

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1