tests: Dependency-inject resolver logger via getTestWFConfig

Jforresterrequested to merge
T418676-di-resolver-logger into main

getTestWFConfig now accepts a resolverLogger override and passes it to the ReferenceResolver constructor, so tests can capture the resolver's outbound-fetch logs without mutating its private state after the fact.

Removes the reach-in into requestContext.resolver_.logger in the Z6820 mixed-entities test.

Then, thread the resolver logger through mswTestRunner for the 11 other logger-checking calls we make.

Bug: T418676
Assisted-by: Claude Opus 4.8

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