Split python-unittest-retagger to 8 batches like python-tagged-unittests

Author: Ariouz

ci.jsonnet

@@ -101,6 +101,7 @@
     local GRAAL_JDK_LATEST          = "graal-jdk-latest",
     local TAGGED_UNITTESTS_SPLIT    = 8,
     local COVERAGE_SPLIT            = 3,
+    local RETAGGER_SPLIT            = 16,
 
     // -----------------------------------------------------------------------------------------------------------------
     // gates
@@ -240,7 +241,7 @@
         "python-unittest-cpython": cpygate + platform_spec(no_jobs) + platform_spec({
             "linux:amd64:jdk-latest"     : tier1,
         }),
-        "python-unittest-retagger": ut_retagger + platform_spec(no_jobs) + platform_spec({
+        "python-unittest-retagger": ut_retagger + platform_spec(no_jobs) + batches(RETAGGER_SPLIT) + platform_spec({
             "linux:amd64:jdk-latest"     : tier3,
             "linux:aarch64:jdk-latest"   : weekly    + t("20:00:00"),
             "darwin:aarch64:jdk-latest"  : weekly    + t("20:00:00"),