fix: harden bun_test launcher args and test metadata

Co-authored-by: Eriyc <50216491+Eriyc@users.noreply.github.com>

tests/bun_test_test/BUILD.bazel

@@ -12,6 +12,7 @@ bun_test(
 bun_test(
     name = "failing_suite",
     srcs = ["failing.test.ts"],
+    tags = ["manual"],
     target_compatible_with = [
         "@platforms//cpu:x86_64",
         "@platforms//os:linux",

tests/bun_test_test/failing.test.ts

@@ -1,5 +1,5 @@
 import { expect, test } from "bun:test";
 
-test("failing suite", () => {
+test("intentionally fails for manual validation", () => {
   expect(1 + 1).toBe(3);
 });

tests/bun_test_test/passing.test.ts

@@ -1,5 +1,5 @@
 import { expect, test } from "bun:test";
 
-test("passing suite", () => {
+test("adds two numbers correctly", () => {
   expect(1 + 1).toBe(2);
 });