Introduce FUNDED_TEST_PRIVATE_KEY and regenerate the cached Anvil state
so the account is already funded, holds minted test tokens and has the
RLN contract allowance approved. setupOnchainGroupManager with
deployContracts=false now short-circuits to buildOnchainGroupManager
with that key: no per-run fund/mint/approve transactions or sleeps.
The state regeneration flow (test_rln_contract_deployment) funds the
fixed key, so regenerated state stays compatible with the constant.
Deployed contract addresses are unchanged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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