Add tag to metrics to ensure unique emission (#6940)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1202552961248957/task/1211650854212283?focus=true

### Description
Add getTag(): String to AttributedMetric

### Steps to test this PR
N/A

### UI changes
| Before  | After |
| ------ | ----- |
!(Upload before screenshot)|(Upload after screenshot)|

Author: cmonfortep

attributed-metrics/attributed-metrics-api/src/main/java/com/duckduckgo/app/attributed/metrics/api/AttributedMetricsClient.kt

@@ -77,4 +77,10 @@ interface AttributedMetric {
      * @return Parameters to be included with this metric
      */
     suspend fun getMetricParameters(): Map<String, String>
+
+    /**
+     * @return Identifier used to deduplicate metric emissions. The same combination of metric
+     *           and tag will only be emitted once.
+     */
+    suspend fun getTag(): String
 }

attributed-metrics/attributed-metrics-impl/src/main/java/com/duckduckgo/app/attributed/metrics/impl/RealAttributedMetricClient.kt

@@ -22,6 +22,7 @@ import com.duckduckgo.app.attributed.metrics.api.EventStats
 import com.duckduckgo.app.attributed.metrics.store.EventRepository
 import com.duckduckgo.app.di.AppCoroutineScope
 import com.duckduckgo.app.statistics.pixels.Pixel
+import com.duckduckgo.app.statistics.pixels.Pixel.PixelType.Unique
 import com.duckduckgo.common.utils.DispatcherProvider
 import com.duckduckgo.di.scopes.AppScope
 import com.squareup.anvil.annotations.ContributesBinding
@@ -71,10 +72,12 @@ class RealAttributedMetricClient @Inject constructor(
         appCoroutineScope.launch(dispatcherProvider.io()) {
             if (!metricsState.isActive()) return@launch
             val pixelName = metric.getPixelName()
+            val tag = metric.getTag()
             logcat(tag = "AttributedMetrics") {
                 "Firing pixel for $pixelName"
             }
-            pixel.fire(pixelName = pixelName, parameters = metric.getMetricParameters())
+            val pixelTag = "${pixelName}_$tag"
+            pixel.fire(pixelName = pixelName, parameters = metric.getMetricParameters(), type = Unique(pixelTag))
         }
     }
 }

attributed-metrics/attributed-metrics-impl/src/test/java/com/duckduckgo/app/attributed/metrics/impl/RealAttributedMetricClientTest.kt

@@ -21,6 +21,7 @@ import com.duckduckgo.app.attributed.metrics.api.AttributedMetric
 import com.duckduckgo.app.attributed.metrics.api.EventStats
 import com.duckduckgo.app.attributed.metrics.store.EventRepository
 import com.duckduckgo.app.statistics.pixels.Pixel
+import com.duckduckgo.app.statistics.pixels.Pixel.PixelType.Unique
 import com.duckduckgo.common.test.CoroutineTestRule
 import kotlinx.coroutines.test.runTest
 import org.junit.Assert.assertEquals
@@ -105,7 +106,7 @@ class RealAttributedMetricClientTest {
 
         testee.emitMetric(testMetric)
 
-        verify(mockPixel).fire(pixelName = "test_pixel", parameters = mapOf("param" to "value"))
+        verify(mockPixel).fire(pixelName = "test_pixel", parameters = mapOf("param" to "value"), type = Unique("test_pixel_test_tag"))
     }
 
     @Test
@@ -121,5 +122,6 @@ class RealAttributedMetricClientTest {
     private class TestAttributedMetric : AttributedMetric {
         override fun getPixelName(): String = "test_pixel"
         override suspend fun getMetricParameters(): Map<String, String> = mapOf("param" to "value")
+        override suspend fun getTag(): String = "test_tag"
     }
 }