fix(ci/benchmarks): use git tree hash for benchmarks (#17817)

Replace commit hash with git tree hash when handing over benchmark
results to GitHub Actions. This resolves caching issues where the exact
commit hash may not have been run in the cache, ensuring consistent
benchmark result lookup across cached and non-cached runs. This affected
`ci-full` runs that were squashed.

Author: ludamad

bootstrap.sh

@@ -314,7 +314,7 @@ function bench {
   rm -rf bench-out
   mkdir -p bench-out
   bench_merge
-  cache_upload bench-$COMMIT_HASH.tar.gz bench-out/bench.json
+  cache_upload bench-$(git rev-parse HEAD^{tree}).tar.gz bench-out/bench.json
 }
 
 function release_github {

ci.sh

@@ -321,7 +321,7 @@ case "$cmd" in
     print_usage
     ;;
   "gh-bench")
-    cache_download bench-$COMMIT_HASH.tar.gz
+    cache_download bench-$(git rev-parse HEAD^{tree}).tar.gz
     ;;
   "uncached-tests")
     if [ -z "$CI_REDIS_AVAILABLE" ]; then

yarn-project/p2p/bootstrap.sh

@@ -14,8 +14,6 @@ function bench {
     ./testbench/run_testbench.sh $config ./bench-out/$config
   done
   ./testbench/consolidate_benchmarks.sh
-
-  cache_upload yarn-project-p2p-bench-results-$COMMIT_HASH.tar.gz ./bench-out/p2p-bench.json
 }
 
 case "$cmd" in