fix(server): Prevent 404s from flooding Sentry

[sentry]

The starlette_http_error_handler was configured to capture all 4xx HTTP errors, including 404 Not Found responses. This led to Sentry being flooded with 'Invalid API request' warnings from bots and health-checkers probing non-existent routes like /health.

This change modifies the starlette_http_error_handler to explicitly exclude 404 status codes from being captured by capture_invalid_request. This ensures that only actionable client errors (400-403, 405-499) are reported to Sentry, reducing noise while maintaining error visibility for legitimate issues. App-level 404s (e.g., JobNotFoundError) are handled separately and remain unaffected.

Fixes NURSE-SCHEDULING-3M

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.65%. Comparing base (1c60cc8) to head (03c33f5).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #56   +/-   ##
=======================================
  Coverage   92.65%   92.65%           
=======================================
  Files         100      100           
  Lines        8250     8250           
  Branches      705      705           
=======================================
  Hits         7644     7644           
  Misses        460      460           
  Partials      146      146           

Flag	Coverage Δ
core	94.15% <100.00%> (ø)
core-macos	94.17% <100.00%> (ø)
core-windows	94.15% <100.00%> (ø)
web-frontend	88.84% <ø> (ø)
web-frontend-macos	88.84% <ø> (ø)
web-frontend-windows	88.84% <ø> (ø)

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Files with missing lines	Coverage Δ
core/nurse_scheduling/server/app.py	91.33% <100.00%> (ø)

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