Add Bug 1823684 [v124] Server Knobs for iOS

[rosahbruno]

📜 Tickets

Bug

💡 Description

Configure Server Knobs for iOS. Makes use of the glean.setMetricsEnabledConfig to remotely enable/disable metric collection via Nimbus experiment.

The Nimbus experiment hasn't been created yet so the API is just getting the default value of "{}", which enables/disables no metrics. Everything should just be working like before.

Testing

1. Setting debug view tag via the GLEAN_DEBUG_VIEW_TAG
2. Run the app and look for the topsites-impression pings. You can trigger this ping by foregrounding the app while on the new tab screen, where you can see topsites.
3. Observe in each ping in the debug viewer that you see the top_sites.contile_advertiser metric being collected - example.
4. Change line 110 of TelemetryWrapper.swift to glean.setMetricsEnabledConfig("{\"top_sites.contile_advertiser\": false}").
5. Run the app again, trigger the topsites-impression ping.
6. Observe that the metric is no longer being collected on the newer pings - example.

📝 Checklist

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• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed I updated documentation / comments for complex code and public methods

[github-actions]

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