ASA Go: API Locks for stats cache access

[conbrad]

Create a lock for each cache key so that only one writer sets the cached result to prevent a thundering heard from all attempting at once.

Updates:

• Replaced process-only coordination with a Redis distributed lock, ensuring Gunicorn workers and pods don’t simultaneously compute the same cold cache key.
• Retained a per-process asyncio.Lock to reduce Redis contention and provide fallback when Redis is unavailable.
• Centralized cache lookup, locking, computation, writing, and release in ASARedisCache.get_or_compute()
• Ensured Redis locks are explicitly released in finally
• Reduced the maximum lock wait from 30 to 5 seconds to keep mobile requests responsive (unsure on what this value should be, load tests may help determine)

Test Links:

Landing Page
MoreCast
Percentile Calculator
FireCalc
FireCalc bookmark
Auto Spatial Advisory (ASA)
HFI Calculator
SFMS Insights
Fire Watch
Weather Toolkit

[codecov]

Codecov Report

❌ Patch coverage is 94.80519% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.92%. Comparing base (cadf2bd) to head (1cbdfd7).

Files with missing lines	Patch %	Lines
.../auto_spatial_advisory/advisory_run_stats/cache.py	90.47%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5803      +/-   ##
==========================================
+ Coverage   68.90%   68.92%   +0.01%     
==========================================
  Files         388      388              
  Lines       21669    21695      +26     
  Branches     2937     2937              
==========================================
+ Hits        14932    14954      +22     
- Misses       5831     5834       +3     
- Partials      906      907       +1     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud