Enqueue rekey pixel (duckduckgo#3826)

Task/Issue URL: https://app.asana.com/0/488551667048375/1205898947038379/f

### Description
Enqueue rekey pixel

### Steps to test this PR
QA optional

Author: aitorvs

network-protection/network-protection-impl/src/main/java/com/duckduckgo/networkprotection/impl/pixels/NetworkProtectionPixelNames.kt

@@ -49,8 +49,8 @@ enum class NetworkProtectionPixelNames(
     NETP_LATENCY_REPORT("m_netp_ev_latency_c"),
     NETP_REPORT_POOR_LATENCY_DAILY("m_netp_ev_poor_latency_d"),
     NETP_REPORT_LATENCY_ERROR_DAILY("m_netp_ev_latency_error_d"),
-    NETP_REKEY_COMPLETED("m_netp_ev_rekey_completed_c"),
-    NETP_REKEY_COMPLETED_DAILY("m_netp_ev_rekey_completed_d"),
+    NETP_REKEY_COMPLETED("m_netp_ev_rekey_completed_c", enqueue = true),
+    NETP_REKEY_COMPLETED_DAILY("m_netp_ev_rekey_completed_d", enqueue = true),
     NETP_VPN_CONFLICT_SHOWN("m_netp_imp_vpn_conflict_dialog_c"),
     NETP_VPN_CONFLICT_SHOWN_DAILY("m_netp_imp_vpn_conflict_dialog_d"),
     NETP_ALWAYSON_CONFLICT_SHOWN("m_netp_imp_always_on_conflict_dialog_c"),

network-protection/network-protection-impl/src/test/java/com/duckduckgo/networkprotection/impl/pixels/RealNetworkProtectionPixelTest.kt

@@ -122,8 +122,8 @@ class RealNetworkProtectionPixelTest {
         testee.reportRekeyCompleted()
         testee.reportRekeyCompleted()
 
-        verify(pixel).fire("m_netp_ev_rekey_completed_d")
-        verify(pixel, times(2)).fire("m_netp_ev_rekey_completed_c")
+        verify(pixel).enqueueFire("m_netp_ev_rekey_completed_d")
+        verify(pixel, times(2)).enqueueFire("m_netp_ev_rekey_completed_c")
     }
 
     @Test