Reduce the parallelism of test run in GH runners

[afritzler]

Summary by CodeRabbit

• Chores
  • Enhanced test execution configuration to dynamically leverage available system processors for improved build performance.

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[coderabbitai]

Walkthrough

The Makefile is updated to restore direct assignment of NPROCS to the count of online processors via shell command, while changing the fallback default from 4 to 1. This affects the default parallelism level for test execution.

Changes

Cohort / File(s)	Summary
Makefile Configuration Makefile	Restored direct NPROCS assignment using getconf _NPROCESSORS_ONLN and lowered fallback default from 4 to 1.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description is empty, missing all required sections from the template including 'Proposed Changes' and 'Fixes' information.	Add a description following the template with proposed changes explaining why parallelism is being reduced and any relevant issue references.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: reducing test parallelism from 4 to 1 processor in GitHub runners.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/gh-tests

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