Add sync ping registration prior to resetGlean calls

This is weird to do in other test classes calling resetGlean, but it's an unfortunate side effect of the new collection enabled mechanisms that'll be fixed up with https://bugzilla.mozilla.org/show_bug.cgi?id=1935001

megazords/ios-rust/MozillaTestServices/MozillaTestServicesTests/NimbusTests.swift

@@ -10,8 +10,18 @@ import XCTest
 
 class NimbusTests: XCTestCase {
     override func setUp() {
+        // Due to recent changes in how upload enabled works, we need to register the custom
+        // Sync pings before they can collect data in tests, even here in Nimbus unfortunately.
+        // See https://bugzilla.mozilla.org/show_bug.cgi?id=1935001 for more info.
+        Glean.shared.registerPings(GleanMetrics.Pings.shared.sync)
+        Glean.shared.registerPings(GleanMetrics.Pings.shared.historySync)
+        Glean.shared.registerPings(GleanMetrics.Pings.shared.bookmarksSync)
+        Glean.shared.registerPings(GleanMetrics.Pings.shared.loginsSync)
+        Glean.shared.registerPings(GleanMetrics.Pings.shared.creditcardsSync)
+        Glean.shared.registerPings(GleanMetrics.Pings.shared.addressesSync)
+        Glean.shared.registerPings(GleanMetrics.Pings.shared.tabsSync)
+
         Glean.shared.resetGlean(clearStores: true)
-        Glean.shared.enableTestingMode()
     }
 
     func emptyExperimentJSON() -> String {

megazords/ios-rust/MozillaTestServices/MozillaTestServicesTests/SyncManagerTelemetryTests.swift

@@ -14,7 +14,8 @@ class SyncManagerTelemetryTests: XCTestCase {
         super.setUp()
 
         // Due to recent changes in how upload enabled works, we need to register the custom
-        // Sync pings before they can be submitted properly.
+        // Sync pings before they can collect data in tests.
+        // See https://bugzilla.mozilla.org/show_bug.cgi?id=1935001 for more info.
         Glean.shared.registerPings(GleanMetrics.Pings.shared.sync)
         Glean.shared.registerPings(GleanMetrics.Pings.shared.historySync)
         Glean.shared.registerPings(GleanMetrics.Pings.shared.bookmarksSync)