test: keep large payloads out of mutant test output

[roxblnfk]

🔍 What was changed

• The 65 MB echo tests (testLongRawBody, testLongRawBodyAsync) no longer let the payload reach a test failure: a ServiceException raised during the call is rethrown with its message cut to 512 bytes, and the MultiRPC variants build their relay pool from SocketRelays instead of a connection string.
• The mutation workflow uploads runtime/infection.log as an artifact, also for failed or cancelled runs.

Why?

• The full Stryker report keeps every mutant's test output in memory, and five mutants produced almost all of it: AbstractRPC.php:63 (IfNegation), Frame.php:108 (IncrementInteger) and Frame.php:156 (DecrementInteger, BitwiseAnd) turn the echoed response into a ServiceException that quotes the whole body; Relay.php:28 (Identical) makes Relay::create() return the STDIN/STDOUT relay, so the request is written to the test process's own stdout.
• Captured output went from 2.6 GB to 72 MB over 493 mutants; Infection's peak memory from 11.77 GB to 0.26 GB with --log-verbosity=all, 0.11 GB with the default verbosity. Escaped mutants and Covered MSI are unchanged (41, 91%).

Checklist

• How was this tested:
  • Mutation workflow run in this PR, with a temporary step ranking mutants by output size
  • Mutants applied by hand and measured locally: testLongRawBody output 302 MB → 12 KB
  • Stryker report sending: only on push to 4.x, to be checked after merge

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📥 Commits

Reviewing files that changed from the base of the PR and between ed18cc9 and c450e6e.

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📒 Files selected for processing (4)

• .github/workflows/mutation.yml
• tests/Goridge/MultiRPC.php
• tests/Goridge/RPC.php
• tests/Goridge/Support/LargePayload.php

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