testing: Add spinlock test and fix for timer tests.

[Fix-Point]

Summary

This PR introduces several enhancements and fixes across multiple testing modules in the NuttX test suite:

1. Spinlock Test Enhancement (testing/ostest/spinlock.c):

   • Added comprehensive spinlock testing framework with support for regular spinlocks, recursive spinlocks (rspinlock), and sequence counters (seqlock)
   • Refactored the test to improve accuracy and minimize scheduling jitters by:
     • Using atomic operations instead of pthread barriers for synchronization
     • Setting thread affinity and maximum priority for more consistent timing
     • Adding CPU core distribution for SMP configurations
   • Fixed Coverity issues by adding null check for total_ns and correcting loop boundary conditions
   • Added proper error checking for pthread operations

2. Timer Test Improvements:

   • Fixed output formatting for timer tests to handle timer_t type changes
   • Relaxed timing constraints for simulated environments (QEMU/SIM) to account for vCPU preemption
   • Fixed timer assertion logic in periodic timer tests
   • Addressed time calculation overflow issues by changing uint32_t to uint64_t

3. Other Test Fixes:

   • Fixed a synchronization bug in watchdog timer test where callback count update order could cause random failures
   • Re-enabled work queue test in flat build mode
   • Added clock measurement to taclebench benchmark
   • Fixed timer jitter test parameters to avoid errors with large USEC_PER_TICK settings

Impact

• Testing Coverage: Significantly improves spinlock testing with support for multiple lock types and SMP configurations
• Test Reliability: Fixes timing issues in simulated environments, making tests more robust on QEMU and simulation platforms
• Code Quality: Addresses multiple Coverity issues and adds proper error handling
• Performance: Improved test accuracy through better thread scheduling and affinity management
• Compatibility: Maintains backward compatibility while fixing type-related formatting issues
• Documentation: Enhanced test output formatting for better debugging and analysis
• Build System: No impact on build process; all changes are confined to test modules

Test

Internal CI/CT passed. Tested on rv-virt:smp, ostest passed.