Bug 1858882 - Update "Learn More" link in private browsing description

(cherry picked from commit 6c24da8bbb019dba0d0b01d5369dd24a52f728a7)

app/src/main/java/org/mozilla/fenix/home/privatebrowsing/controller/PrivateBrowsingController.kt

@@ -42,8 +42,11 @@ class DefaultPrivateBrowsingController(
 ) : PrivateBrowsingController {
 
     override fun handleLearnMoreClicked() {
+        val learnMoreURL = SupportUtils.getGenericSumoURLForTopic(SupportUtils.SumoTopic.PRIVATE_BROWSING_MYTHS) +
+            "?as=u&utm_source=inproduct"
+
         activity.openToBrowserAndLoad(
-            searchTermOrURL = SupportUtils.getGenericSumoURLForTopic(SupportUtils.SumoTopic.PRIVATE_BROWSING_MYTHS),
+            searchTermOrURL = learnMoreURL,
             newTab = true,
             from = BrowserDirection.FromHome,
         )

app/src/test/java/org/mozilla/fenix/home/privatebrowsing/DefaultPrivateBrowsingControllerTest.kt

@@ -28,7 +28,6 @@ import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.settings
 import org.mozilla.fenix.home.Mode
 import org.mozilla.fenix.home.privatebrowsing.controller.DefaultPrivateBrowsingController
-import org.mozilla.fenix.settings.SupportUtils
 import org.mozilla.fenix.utils.Settings
 
 class DefaultPrivateBrowsingControllerTest {
@@ -61,12 +60,13 @@ class DefaultPrivateBrowsingControllerTest {
 
     @Test
     fun `WHEN private browsing learn more link is clicked THEN open support page in browser`() {
+        val learnMoreURL = "https://support.mozilla.org/en-US/kb/common-myths-about-private-browsing?as=u&utm_source=inproduct"
+
         controller.handleLearnMoreClicked()
 
         verify {
             activity.openToBrowserAndLoad(
-                searchTermOrURL = SupportUtils.getGenericSumoURLForTopic
-                    (SupportUtils.SumoTopic.PRIVATE_BROWSING_MYTHS),
+                searchTermOrURL = learnMoreURL,
                 newTab = true,
                 from = BrowserDirection.FromHome,
             )