Fix postcommit gate (there are no stuck checks at this moment) (ydb-platform#7102)

Author: maximyurchuk

.github/workflows/gate_postcommits.yml

@@ -18,7 +18,7 @@ jobs:
           jq '[.[] | select(.waiting_seconds > 600)] | length')
         echo "Queue size: $queue_size"
         # temporary solution for https://www.githubstatus.com/incidents/m70hk23gx3nx (some workflows are uncancellable stuck)
-        if (( queue_size > 8 ));then
+        if (( queue_size > 0 ));then
           echo "Close gate for postcommits"
           query='.runners[] | select(.labels[].name=="ghrun") | select( any([.labels[].name][]; .=="postcommit")) | .id'
         else
@@ -42,7 +42,7 @@ jobs:
         echo "$j1" | sed '$d' | jq "$query" | while read x;do
           echo "Runner: $x"
           # temporary solution for https://www.githubstatus.com/incidents/m70hk23gx3nx (some workflows are uncancellable stuck)
-          if (( queue_size > 8 ));then
+          if (( queue_size > 0 ));then
             curl -Ls -X DELETE -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{secrets.GH_PERSONAL_ACCESS_TOKEN}}" \
               -H "X-GitHub-Api-Version: 2022-11-28" \
               https://api.github.com/repos/${{github.repository}}/actions/runners/$x/labels/postcommit