[OPIK-8230] [BE] fix: scope the trace delete mutation to the batch's own partitions - #8131

 36 files  ± 0   36 suites  ±0   5m 26s ⏱️ -38s
348 tests ± 0  348 ✅ ± 0  0 💤 ±0  0 ❌ ±0 
348 runs  +45  348 ✅ +45  0 💤 ±0  0 ❌ ±0 

Results for commit 72a67bc. ± Comparison against earlier commit 4b1d936.