Fix getStandaloneSigner is not defined

[naddison36]

Summary

Fix Talos actions failing with:

ReferenceError: getStandaloneSigner is not defined

The Hardhat-to-standalone migration updated utils/signers.js to call the new Talos signer and network utilities but omitted the required bridge functions. This affected otokenOethbUpdateWoethPrice and other actions using the shared getSigner() helper.

Changes

• Lazily resolve the standalone signer from tasks/lib/signer.ts.
• Lazily resolve the provider from tasks/lib/network.ts.
• Preserve compatibility when optional Talos dependencies are unavailable.
• Remove stale signer and nonce-queue code superseded by the standalone signer implementation.

Verification

• Ran Prettier.
• Ran targeted ESLint.
• Verified utils/signers.js loads without optional Talos dependencies.
• Ran git diff --check.

Full TypeScript checking remains blocked by unrelated existing export errors and the locally absent optional @oplabs/talos-client dependency.