Fix: avoid further dispatch when ThreadContext population fails #121665
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While adding some tests to assert that ES handling of multiple headers is in line with the specs (headers are treated in a case-insensitive way - see #116139), we discovered a problem introduced with #95040.
If the header validation fails while we populate the ThreadContext, an error answer is sent, but we also proceed with the normal dispatch. This causes an error downstream: as soon as we try to read the request body, an assertion is hit, as the request has already been closed and marked as completed.
This PR fixes the issue by making the 2 paths mutually exclusive.