Prior to this commit, the Observation Servlet filter would record unhandled exceptions on the observation context but would leave the default HTTP response status as is. Servlet containers do set the response status in that case to 500 by default. Not doing that at the Servlet filter level results in invalid observations, stating that the HTTP response status is 200 (because the error status hasn't been set yet by the container) and as a result, the outcome is SUCCESS. This commit ensures that the error status is set in those cases, aligning the behavior with Servlet containers. Fixes gh-29512
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