feat(tests): env agnostic boostrapper for e2e/load

[rodrigombsoares]

Summary

Third stacked PR after pr2-token-lane. Extracts a shared environment bootstrap layer for CCIP devenv e2e and load tests so both suites use one setup path instead of duplicating inline LoadOutput / NewLibFromCCVEnv / ChainsMap / verifier wiring. This env bootstrapper takes care of env specific configs (devenv/prod-testnet/mainnet)

Tests select their target via -ccip-env (default devenv, overridable by CCIP_ENV) and share BootstrapE2E. IsRemote() branches for prod-testnet are included but inactive in default devenv CI.

WASP fires more Call() invocations than estimateMessages predicts; SetSequentialSends now uses estimate + 3 buffer.

Stack: main → pr1-load-metrics → pr2-token-lane → pr3-env-bootstrap

Features

Environment selection (env.go, env_test.go)

• -ccip-env flag with CCIP_ENV default (devenv | prod-testnet)
• ResolveConfigPath with CCIP_CONFIG_FILE override only on prod-testnet — devenv always uses env-canton-evm-out.toml, ignoring a stray CCIP_CONFIG_FILE in the environment
• ParseEnvFromFlag, ConfigPath(), IsRemote()
• Unit tests updated: devenv ignores CCIP_CONFIG_FILE; prod-testnet still honors it

Shared bootstrap (helpers.go)

• E2EBootstrap struct and BootstrapE2E(t, env)
• Env-aware helpers: SetupCantonSend, SetupCantonTokenSend, SetupCantonReceive, ResolveEVMReceiver, ConfirmCantonSendOnSource, ConfirmEVMSendOnSource, ConfirmExecTimeout, ConfirmSendTimeout(env), EVMToCantonMessageOptions
• Devenv-only: container log capture on failure
• Remote-only: skip when CANTON_GRPC_URL unset; log required balances instead of minting
• SetSequentialSends before SetupSend (PR2 fix preserved)

E2E tests

• canton2evm_e2e_test.go and evm2canton_e2e_test.go refactored to ParseEnvFromFlag + BootstrapE2E
• Token lanes use ResolveTokenLane(t, boot.Env, …)
• canton2evm_send_validation_test.go left unchanged (inline devenv fixture)

Load tests

• Boot-based discover/confirm helpers; runWASP skip-exec and indexer logging
• All four gun_*_test.go files wired through shared bootstrap
• Token load uses boot.SetupCantonTokenSend via sequentialSendsForLoad(sched) — estimateMessages + waspSequentialSendBuffer (3) because WASP always fires more calls than the schedule estimate

CI fix (ccip-load-tests.yml)

• CCIP_CONFIG_FILE gated to prod-testnet only (matches composite action behavior):

  CCIP_CONFIG_FILE: ${{ inputs.ccip_env == 'prod-testnet' && inputs.config_file || '' }}

Testing

• E2E tests on CI
• Load tests on devenv fired from GH Actions
  • https://github.com/smartcontractkit/chainlink-canton/actions/runs/28952629558/job/85903164726

[github-actions]

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