ci: split live creation-tx API tests into their own CI job

[marcocastignoli]

Summary

• Move the getCreatorTx tests that call live third-party APIs (Blockscout, Routescan, Etherscan, Avalanche, VeChain, NodeReal, Nexus) from test/unit/ into services/server/test/creation-tx-apis/, outside the test-server globs.
• Add a test:creation-tx-apis npm script and a new CircleCI job test-creation-tx-apis in both workflows. No other job requires it.
• The mocked tests (Etherscan API key handling, binary search) stay in the unit suite.

Why

test-server has failed on every CI run since Aug 25 because NodeReal's nr_getContractCreationTransaction stopped returning the creation tx (the CI key gets a response with no result.hash; production BSC currently falls back to Etherscan). Any of the live providers in that loop can take CI hostage the same way — there's precedent in the file (chain 51 test commented out, live binary-search test skipped).

CircleCI reports one GitHub status per job, and staging has no required status checks, so after this change a provider outage shows up as a red ci/circleci: test-creation-tx-apis line on PRs while test-server stays green and meaningful. The live coverage still runs on every PR, so "the external service is really failing" remains visible.

Notes

• test-creation-tx-apis will be red from day one: the NodeReal integration is genuinely broken. Someone with access to the NodeReal dashboard should check the key/plan.
• Etherscan and VeChain tests keep their existing skip on external PRs (CIRCLE_PR_REPONAME), and NodeReal keeps its skip when NODEREAL_API_KEY is unset.

🤖 Generated with Claude Code

[kuzdogan]

The commented-out chain 51 (XDC Apothem) test can be removed entirely instead of carried over. https://apothem.xdcscan.io/ is down (HTTP 521), and the chain already has an Etherscan instance that returns the creation tx. We are dropping the blocksScanApi override in sourcifyeth/sourcify-chains#129 and the blocksScanApi code path in #2948, so there is nothing left for that test to cover.

_{Posted with Claude Code}