[flake8-logging] Avoid false positive for exc_info=True outside logger.exception (LOG014) (#18737)

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## Summary

Fixes https://github.com/astral-sh/ruff/issues/18726 by also checking if
its a literal and not only that it is truthy. See also the first comment
in the issue.

It would have been nice to check for inheritance of BaseException but I
figured that is not possible yet...

## Test Plan

I added a few tests for valid input to exc_info

crates/ruff_linter/resources/test/fixtures/flake8_logging/LOG014_0.py

@@ -32,6 +32,12 @@ except ...:
 
 ### No errors
 
+logging.info("", exc_info=ValueError())
+logger.info("", exc_info=ValueError())
+
+logging.info("", exc_info=(exc_type, exc_value, exc_traceback))
+logger.info("", exc_info=(exc_type, exc_value, exc_traceback))
+
 logging.info("", exc_info=a)
 logger.info("", exc_info=a)
 

crates/ruff_linter/src/rules/flake8_logging/rules/exc_info_outside_except_handler.rs

@@ -98,6 +98,10 @@ pub(crate) fn exc_info_outside_except_handler(checker: &Checker, call: &ExprCall
         return;
     };
 
+    if !exc_info.value.is_literal_expr() {
+        return;
+    }
+
     let truthiness = Truthiness::from_expr(&exc_info.value, |id| semantic.has_builtin_binding(id));
 
     if truthiness.into_bool() != Some(true) {