[Bazel] Fix broken build rules or mark them manual (#9913)

* Fix filename for unittest_gen_import.proto.

* Add 'manual' tags to jvm_export rules so they aren't selected by wildcard

* Run buildifier
diff --git a/java/kotlin/BUILD.bazel b/java/kotlin/BUILD.bazel
index a3cf83d..859b86b 100644
--- a/java/kotlin/BUILD.bazel
+++ b/java/kotlin/BUILD.bazel
@@ -59,6 +59,7 @@
     maven_coordinates = "com.google.protobuf:protobuf-kotlin:%s" % PROTOBUF_JAVA_VERSION,
     pom_template = "//java/kotlin:pom_template.xml",
     resources = ["//:well_known_protos"],
+    tags = ["manual"],
     runtime_deps = [
         ":bytestring_lib",
         ":full_extensions",