[Gradle][Cocoapods] Private Pods with SSH Git Url not allowed in custom specRepos

#KT-48887

Merge-request: KT-MR-4770

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/cocoapods/CocoapodsExtension.kt

@@ -360,14 +360,14 @@ open class CocoapodsExtension(private val project: Project) {
 
     class SpecRepos {
         @get:Internal
-        internal val specRepos = mutableSetOf(URI("https://cdn.cocoapods.org"))
+        internal val specRepos = mutableSetOf("https://cdn.cocoapods.org")
 
         fun url(url: String) {
-            specRepos.add(URI(url))
+            specRepos.add(url)
         }
 
         @Input
-        internal fun getAll(): Collection<URI> {
+        internal fun getAll(): Collection<String> {
             return specRepos
         }
     }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/tasks/AdvancedCocoapodsTasks.kt

@@ -663,6 +663,23 @@ private object CocoapodsErrorHandlingUtil {
                 |       
             """.trimMargin()
             return message
+        } else if (
+            error.contains("Unable to add a source with url") ||
+            error.contains("Couldn't determine repo name for URL") ||
+            error.contains("Unable to find a specification")
+        ) {
+            message += """
+                |
+                |        Possible reason: spec repos are not configured correctly.
+                |        Ensure that spec repos are correctly configured for all private pod dependencies:
+                |        cocoapods {
+                |           specRepos {
+                |               url("<private spec repo url>")
+                |           }
+                |        }
+                |       
+            """.trimMargin()
+            return message
         }
         return null
     }