Revert PR #924: Lite tests parallelization (slowed CI)

[erikdarlingdata]

Summary

Reverts PR #924. The parallelization config was meant to speed up the Lite test step but actually made it worse on the GH Actions Windows runner: 8m 49s vs the prior ~7-min baseline. The parallelAlgorithm: aggressive + maxParallelThreads: -1 settings cause thread-contention overhead on the runner's 2 cores. Local 2m 21s wasn't representative.

This restores the original test setup. Follow-up work (if revisited) should:

• Set maxParallelThreads: 2 to match the runner's core count
• Default parallelAlgorithm: conservative instead of aggressive
• Possibly split FactCollectorTests (the slowest class at 37 tests × ~15s each) since within-class tests still run sequentially

Test plan

• Build is green after revert
• CI test step returns to ~7m baseline

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