Query Sync: we don't read systemIncludes in visitProjectDefinition

[tpasternak]

Description of the bug:

It is unclear what are the consequences of that

intellij/querysync/java/com/google/idea/blaze/qsync/project/SnapshotSerializer.java

Line 74 in 9cebd40

projectDefinition.testSources().forEach(proto::addTestSources);

Which category does this issue belong to?

No response

What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

No response

Which Intellij IDE are you using? Please provide the specific version.

No response

What programming languages and tools are you using? Please provide specific versions.

No response

What Bazel plugin version are you using?

No response

Have you found anything relevant by searching the web?

No response

Any other information, logs, or outputs that you want to share?

No response