Revert "build: disable must-use-promises check in ts_library tsetse for tests as... (#31019)" (#31267)

This reverts commit 5bec683692.

Reason: this causes failures in g3 with i18n extraction. See #31267.

PR Close #31267

packages/tsconfig-test.json

@@ -5,10 +5,6 @@
   "extends": "./tsconfig-build.json",
   "compilerOptions": {
     "types": ["node", "jasmine"],
-    "plugins": [{
-        "name": "@bazel/tsetse",
-        "disabledRules": ["must-use-promises"],
-    }],
   },
   "bazelOptions": {
     "suppressTsconfigOverrideWarnings": true,