Test FCM's max TTL is enforced

[data-sync-user]

We already mock FCM in unit tests, so we can easily add a test to ensure we’re enforcing its maximum TTL (fixed here) with a new test.

┆Issue is synchronized with this Jira Task

[data-sync-user]

➤ Jessilyn Davis commented:

JR Conlin to take this and reassign. It’s a great first bug 😄

[data-sync-user]

➤ Taddes Korris commented:

Moving to Push Service Maintenance Collector https://mozilla-hub.atlassian.net/browse/PUSH-122 ( https://mozilla-hub.atlassian.net/browse/PUSH-122|smart-link )