[OPIK-8192] [BE] fix: drop undecodable scoring stream messages instead of wedging the stream - #8089

 53 files   -  4   53 suites   - 4   6m 56s ⏱️ -18s
583 tests +16  579 ✅ +15  4 💤 +1  0 ❌ ±0 
564 runs  +25  560 ✅ +24  4 💤 +1  0 ❌ ±0 

Results for commit 316db5a. ± Comparison against earlier commit ad70f77.