Exporting MakeBazelTarget() in testing.go

Since we are putting conversion tests in the same
package as the module being converted from now on

Test: m bp2build
Change-Id: Ied53589d497fef70bfa11d8f6067459c9a50cd72
diff --git a/bp2build/java_plugin_conversion_test.go b/bp2build/java_plugin_conversion_test.go
index 2d2e5ff..d9049d4 100644
--- a/bp2build/java_plugin_conversion_test.go
+++ b/bp2build/java_plugin_conversion_test.go
@@ -54,7 +54,7 @@
     bazel_module: { bp2build_available: false },
 }`,
 		ExpectedBazelTargets: []string{
-			makeBazelTarget("java_plugin", "java-plug-1", AttrNameToString{
+			MakeBazelTarget("java_plugin", "java-plug-1", AttrNameToString{
 				"target_compatible_with": `select({
         "//build/bazel/platforms/os:android": ["@platforms//:incompatible"],
         "//conditions:default": [],
@@ -95,7 +95,7 @@
     bazel_module: { bp2build_available: false },
 }`,
 		ExpectedBazelTargets: []string{
-			makeBazelTarget("java_plugin", "java-plug-1", AttrNameToString{
+			MakeBazelTarget("java_plugin", "java-plug-1", AttrNameToString{
 				"target_compatible_with": `select({
         "//build/bazel/platforms/os:android": ["@platforms//:incompatible"],
         "//conditions:default": [],