Remove/rename usages of "graal_common" in CI files

* graal_common is normally the name for ci/ci_common/common.jsonnet,
  but here it was used for the global common file (ci/common.jsonnet),
  which is very confusing. That file is normally referred as "common".

Author: eregon

ci/constants.libsonnet

@@ -1,5 +1,5 @@
 {
-    local graal_common          = import "graal/ci/common.jsonnet",
+    local common = import "graal/ci/common.jsonnet",
 
     MX_VERSION:: "HEAD",
 
@@ -24,12 +24,12 @@
     },
 
     TARGET:: {
-        onDemand: graal_common.frequencies.on_demand.targets,
-        postMerge: graal_common.frequencies.post_merge.targets,
-        daily: graal_common.frequencies.daily.targets,
-        weekly: graal_common.frequencies.weekly.targets,
-        monthly: graal_common.frequencies.monthly.targets,
-        gate: graal_common.frequencies.gate.targets,
+        onDemand: common.frequencies.on_demand.targets,
+        postMerge: common.frequencies.post_merge.targets,
+        daily: common.frequencies.daily.targets,
+        weekly: common.frequencies.weekly.targets,
+        monthly: common.frequencies.monthly.targets,
+        gate: common.frequencies.gate.targets,
     },
 
     NOTIFY_GROUPS:: ["[email protected]"],

ci/python-bench.libsonnet

@@ -1,6 +1,5 @@
 (import "python-gate.libsonnet") +
 {
-    local graal_common          = import "graal/common.json",
     local common                = import "graal/ci/ci_common/common.jsonnet",
     local common_util           = import "graal/ci/ci_common/common-utils.libsonnet",
     local run_spec              = import "graal/ci/ci_common/run-spec.libsonnet",

ci/python-gate.libsonnet

@@ -1,5 +1,4 @@
 {
-    local graal_common          = import "graal/ci/common.jsonnet",
     local common                = import "graal/ci/ci_common/common.jsonnet",
     local common_util           = import "graal/ci/ci_common/common-utils.libsonnet",
     local run_spec              = import "graal/ci/ci_common/run-spec.libsonnet",
@@ -81,7 +80,7 @@
     //------------------------------------------------------------------------------------------------------------------
     local DOWNLOADS = {
         common: {
-            GRADLE_JAVA_HOME: graal_common.jdks_data["oraclejdk21"],
+            GRADLE_JAVA_HOME: common.jdks_data["oraclejdk21"],
         },
         linux: {
             common: {
@@ -442,13 +441,13 @@
 
     local jdk_spec = task_spec(evaluate_late({
         "select_graalvm_if_older_jdk": function (b)
-            if b.jdk_version < graal_common.jdks["labsjdk-ee-latest"].jdk_version then
+            if b.jdk_version < common.jdks["labsjdk-ee-latest"].jdk_version then
                 {
                     downloads+: {
-                        LATEST_JAVA_HOME: graal_common.jdks_data["labsjdk-ce-latest"],
+                        LATEST_JAVA_HOME: common.jdks_data["labsjdk-ce-latest"],
                     }
                 } +
-                graal_common.jdks["graalvm-ee-" + b.jdk_version] +
+                common.jdks["graalvm-ee-" + b.jdk_version] +
                 {
                     dynamic_imports+:: [],
                     environment+: {
@@ -566,7 +565,7 @@
     local base_style_gate = $.graalpy_eclipse_gate + task_spec({
         dynamic_imports:: ["/truffle"],
         downloads +: {
-            EXTRA_JAVA_HOMES: graal_common.jdks_data["labsjdk-ce-21"],
+            EXTRA_JAVA_HOMES: common.jdks_data["labsjdk-ce-21"],
         },
         packages +: {
           "pip:pylint": "==2.4.4",

ci/utils.libsonnet

@@ -1,5 +1,5 @@
 local const = import 'constants.libsonnet';
-local graal_common = import "graal/ci/common.jsonnet";
+local common = import "graal/ci/common.jsonnet";
 
 {
     // add a graal option
@@ -36,7 +36,7 @@ local graal_common = import "graal/ci/common.jsonnet";
 
     ensure_no_mx_wrong_build(builds):: [
         b  + (
-            if std.objectHas(b, "setup") && b.jdk_version != graal_common.jdks["labsjdk-ee-latest"].jdk_version then
+            if std.objectHas(b, "setup") && b.jdk_version != common.jdks["labsjdk-ee-latest"].jdk_version then
                 assert (std.length([step for step in b.setup if std.length(std.find("build", step)) != 0 && std.length(std.find("mx", step)) != 0]) == 0) : b.name + " should not call build in " + b.setup;
                 {}
             else