safe-global / safe-client-gateway / 18500100518

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fix: add SafeMigration contract support for version detection

Extends the migration transaction detection logic to support SafeMigration
contracts in addition to SafeToL2Migration contracts. This fixes the issue
where the Client Gateway couldn't calculate safeTxHash for Safes with null
versions when proposing SafeMigration transactions.

## Changes

- Add `getSafeMigrationDeployments()` helper function in deployments.ts
- Update `detectDelegateMigration()` to check both SafeToL2Migration and
  SafeMigration contracts
- Implement version inference for SafeMigration by checking available
  singletons on the target chain (since SafeMigration functions have no
  parameters and use immutable addresses set at deployment)

## Test Coverage

- Add encoder builder for SafeMigration functions (migrateL2Singleton,
  migrateL2WithFallbackHandler, migrateSingleton, migrateWithFallbackHandler)
- Add 8 comprehensive unit tests covering:
  - Success cases for all 4 SafeMigration functions
  - Rejection of unofficial migration contracts
  - Rejection of non-DELEGATE operations
  - Rejection of transactions without data
  - Version inference behavior when singletons are/aren't available

Fixes production issue where Safe Shield migration transactions were failing
with "422: Could not calculate safeTxHash" error.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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