CI: Remove variants arg from package step (#62858)

* Remove variants arg from package step

# Conflicts:
#	.drone.yml

* Fix starlark lint

* Default to releaseModeConfig.Variants

* Check for empty variants arg

scripts/drone/pipelines/build.star

@@ -62,7 +62,6 @@ def build_e2e(trigger, ver_mode):
     ]
 
     build_steps = []
-    variants = None
 
     if ver_mode == "pr":
         build_steps.extend(
@@ -72,20 +71,13 @@ def build_e2e(trigger, ver_mode):
             ],
         )
 
-        variants = [
-            "linux-amd64",
-            "linux-amd64-musl",
-            "darwin-amd64",
-            "windows-amd64",
-        ]
-
     build_steps.extend(
         [
             build_backend_step(edition = edition, ver_mode = ver_mode),
             build_frontend_step(edition = edition, ver_mode = ver_mode),
             build_frontend_package_step(edition = edition, ver_mode = ver_mode),
             build_plugins_step(edition = edition, ver_mode = ver_mode),
-            package_step(edition = edition, variants = variants, ver_mode = ver_mode),
+            package_step(edition = edition, ver_mode = ver_mode),
             grafana_server_step(edition = edition),
             e2e_tests_step("dashboards-suite"),
             e2e_tests_step("smoke-tests-suite"),