[balsa] Disallow multiple Content-Length headers, even if identical. #28931
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Tracking issue: #21245
Signed-off-by: Bence Béky bnc@google.com
Commit Message:[balsa] Disallow multiple Content-Length headers, even if identical.
Additional Description:
Risk Level: low, changed code protected by existing default-false runtime flag.
Testing: //test/common/http/http1:codec_impl_test
Release Notes: n/a
Platform Specific Features: n/a
Runtime guard: envoy.reloadable_features.http1_use_balsa_parser