fix(logging): emit log without stack trace when exception is in disable_stack_trace

[skylarkoo7]

Summary

disable_stack_trace suppresses exception logging entirely instead of only suppressing the stack trace. When an exception's status code or class matches an entry in disable_stack_trace, the handle_exception_logging method short-circuits completely — no log line is emitted at all, not even a one-line error message.

The fix separates the "should we log?" decision from the "should we include the stack trace?" decision:

• The handler is now always invoked when logging is enabled, regardless of disable_stack_trace
• When the exception matches disable_stack_trace, the handler receives an empty traceback list ([]) instead of the formatted exception
• When it doesn't match, the handler receives the full traceback as before

Changes

• litestar/middleware/_internal/exceptions/middleware.py — split the handle_exception_logging conditional into a "should log" check and a separate "include stack trace" check; pass [] when stack trace is suppressed
• litestar/logging/config.py — default exception logging handlers (both standard-lib and structlog) now check tb: use logger.exception() when traceback is present, logger.error() when it is empty
• tests/unit/test_logging/test_logging_config.py — updated test_disable_stack_trace to assert the handler IS always called, and that tb is empty when stack trace is suppressed
• tests/unit/test_logging/test_structlog_config.py — same update for test_structlog_disable_stack_trace

Test plan

• All 10 parametrized cases in both test files updated to verify: handler is always called, tb is non-empty when stack trace is expected, tb is [] when stack trace is suppressed
• Custom handlers that inspect the tb argument will see [] for suppressed exceptions and can decide their own behavior
• Backward compatible: no change in behavior when disable_stack_trace is empty (the default)

Fixes #4510

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.85%. Comparing base (f16b520) to head (725ef88).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4588   +/-   ##
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  Coverage   97.85%   97.85%           
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  Files         297      297           
  Lines       15339    15347    +8     
  Branches     1721     1723    +2     
=======================================
+ Hits        15010    15018    +8     
  Misses        188      188           
  Partials      141      141           

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[cofin]

#4593 is probably a better place for this update.