test(ads-client): added additional unit test for staging URL to ensure runtime safety.#7301

copyrighthero merged 2 commits intomozilla:mainmozilla/application-services:mainfrom

copyrighthero:feat/ac-44--test-ads-client-staging-urlcopyrighthero/mozilla--application-services:feat/ac-44--test-ads-client-staging-urlCopy head branch name to clipboard