The SourceVisitor uses the engineVersion parameter to determine whether it needs to check for changes to artifacts or if it can assume that artifacts are unmodified from a versioned build of the engine. engineVersion is set based on whether the Artifacts instance sets the isLocalEngine property.
CachedLocalWebSdkArtifacts (instantiated when the --local-web-sdk flag is used) was only setting isLocalEngine if --local-engine was also used. This caused the build system to ignore changes to the files in the locally built flutter_web_sdk when using --local-web-sdk alone.
This PR renames Artifacts.isLocalEngine to usesLocalArtifacts in order to clarify what it means. It also changes CachedLocalWebSdkArtifacts to always enable usesLocalArtifacts.
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