[Service Bus] Fix mocha glob pattern to pick tests correctly (#14127)

Fixes https://github.com/Azure/azure-sdk-for-js/issues/13797

Reference
- https://mochajs.org/#the-test-directory
- https://stackoverflow.com/questions/35482278/mochas-glob-behaviour/36050601

sdk/servicebus/service-bus/package.json

@@ -73,7 +73,7 @@
     "test:node": "npm run clean && npm run build:test:node && npm run integration-test:node",
     "test": "npm run test:node && npm run test:browser",
     "unit-test:browser": "echo skipped",
-    "unit-test:node": "mocha -r esm --require source-map-support/register --reporter ../../../common/tools/mocha-multi-reporter.js --timeout 120000 --full-trace dist-esm/test/internal/unit/*.spec.js dist-esm/test/internal/node/*.spec.js",
+    "unit-test:node": "mocha -r esm --require source-map-support/register --reporter ../../../common/tools/mocha-multi-reporter.js --timeout 120000 --full-trace \"dist-esm/test/internal/unit/*.spec.js\" \"dist-esm/test/internal/node/*.spec.js\"",
     "unit-test": "npm run unit-test:node && npm run unit-test:browser",
     "docs": "typedoc --excludePrivate --excludeNotExported --excludeExternals --stripInternal --mode file --out ./dist/docs ./src"
   },