Add error and message to privacy config download error pixel (#6131)

Task/Issue URL:
https://app.asana.com/1/137249556945/task/1210365417691801?focus=true

### Description
This PR adds an error code and message to the privacy config download
error pixel

### Steps to test this PR

- [x] Throw an exception in the `RealPrivacyConfigDownloader` when
downloading the remote config and check the pixel has the message
- [ ] You can also change the privacy config url for this.

Author: marcosholgado

privacy-config/privacy-config-impl/src/main/java/com/duckduckgo/privacy/config/impl/RealPrivacyConfigDownloader.kt

@@ -30,6 +30,7 @@ import com.duckduckgo.privacy.config.impl.RealPrivacyConfigDownloader.DownloadEr
 import com.duckduckgo.privacy.config.impl.network.PrivacyConfigService
 import com.squareup.anvil.annotations.ContributesBinding
 import javax.inject.Inject
+import retrofit2.HttpException
 import timber.log.Timber
 
 /** Public interface for download remote privacy config */
@@ -79,8 +80,17 @@ class RealPrivacyConfigDownloader @Inject constructor(
             }
         }.onFailure {
             // error downloading remote config
+            val code = if (it is HttpException) {
+                it.code().toString()
+            } else {
+                null
+            }
+            val params = mapOf(
+                "code" to (code ?: "unknown"),
+                "message" to (it.localizedMessage ?: "unknown"),
+            )
             Timber.w(it.localizedMessage)
-            notifyErrorToCallbacks(DOWNLOAD_ERROR)
+            notifyErrorToCallbacks(DOWNLOAD_ERROR, params)
         }
 
         return if (response.isFailure) {
@@ -91,8 +101,8 @@ class RealPrivacyConfigDownloader @Inject constructor(
         }
     }
 
-    private fun notifyErrorToCallbacks(reason: DownloadError) {
-        pixel.fire(reason.pixelName)
+    private fun notifyErrorToCallbacks(reason: DownloadError, params: Map<String, String> = emptyMap()) {
+        pixel.fire(reason.pixelName, params)
     }
 
     private enum class DownloadError(val pixelName: String) {

privacy-config/privacy-config-impl/src/test/java/com/duckduckgo/privacy/config/impl/RealPrivacyConfigDownloaderTest.kt

@@ -69,7 +69,7 @@ class RealPrivacyConfigDownloaderTest {
                 pixel,
             )
         assertTrue(testee.download() is Error)
-        verify(pixel).fire("m_privacy_config_download_error")
+        verify(pixel).fire("m_privacy_config_download_error", mapOf("code" to "unknown", "message" to "unknown"))
     }
 
     @Test