- Fixes and issue with `test sending of background pings` that was causing it to timeout when `triggerWorkManager()` was called due to only enqueueing a single response when we actually need two, one for events ping and one for baseline ping.
- Adds an assert to `triggerWorkManager()` around the `PingUploadWorker.uploadPings()` function to help catch similar issues in the future 

This just updates glean_parser to get the improvements from
https://github.com/mozilla/glean_parser/pull/53

- Make serialization and enqueuing of Worker happen in background task.
- Fix race condition in test: `process removes files that do not have UUID names`() was using a background thread in order to write a bad ping, since this is a test and the test was the one doing the writing, it should be synchronously writing instead.
- Add enableTestMode to MetricsPingSchedulerTest

Appservices artifacts are now being manually mirrored to m.m.o.
Eventually, they will be automatically published there in the first place.

The `MetricsPingWorker` was an inner class of the metrics
ping scheduler. However, `WorkManager` was unable to instantiate
it. This solves the issue by moving the worker out of the
scheduler class, removing the inner qualifier. This additionally
restores some tests that were previously disabled.

Update search engine parser tests (+8 squashed commits)
Squashed commits:
[c86797554] Changelog
[a821845c2] detekt/ktlint
[0101c7735] Changelog
[35e9e8d5d] Wrap up search engine lists and default into the search engine manager.

Includes tests.
[6aed07cd8] Implement searchDefault and searchOrder, including tests in the SearchProvider.
[58bad346f] Find the most specific attribute for that locale. Support reordering of list via the `searchOrder` attribute.
[bc10a48b2] Fix tests to match new list.json.
[a781b2f9a] Freshen search plugins and list.json.

Including: deleting Yahoo.

Move the language helper functions to LanguageUtils.kt and move the last remaining init line to Glean.kt, allowing us to remove Baseline.kt
Rename "language" to "locale" where applicable

Update glean_parser version


gag


20.1


Update import statements in glean tests