fix: Use classloader for loading test resources to ensure CI compatibility

The willReturnValidJsonWebKeys() method was using a relative file path
(src/test/resources/rsa_jwks.json) which works locally when the working
directory is the module folder, but fails in CI where the working directory
is the project root.

Changed to use classloader.getResourceAsStream() which works regardless
of the current working directory.

Also improved error handling to actually throw the exception instead of
silently ignoring it, which made debugging difficult.

Author: pmathew92

auth0/src/test/java/com/auth0/android/util/AuthenticationAPIMockServer.kt

@@ -1,8 +1,6 @@
 package com.auth0.android.util
 
 import okhttp3.mockwebserver.MockResponse
-import java.nio.file.Files
-import java.nio.file.Paths
 
 internal class AuthenticationAPIMockServer : APIMockServer() {
 
@@ -128,11 +126,14 @@ internal class AuthenticationAPIMockServer : APIMockServer() {
 
     fun willReturnValidJsonWebKeys(): AuthenticationAPIMockServer {
         try {
-            val encoded = Files.readAllBytes(Paths.get("src/test/resources/rsa_jwks.json"))
-            val json = String(encoded)
+            // Use classloader to load resource file - works regardless of working directory
+            val inputStream = this::class.java.classLoader?.getResourceAsStream("rsa_jwks.json")
+                ?: throw IllegalStateException("Could not find rsa_jwks.json in test resources")
+            val json = inputStream.bufferedReader().use { it.readText() }
             server.enqueue(responseWithJSON(json, 200))
-        } catch (ignored: Exception) {
-            println("File parsing error")
+        } catch (e: Exception) {
+            println("File parsing error: ${e.message}")
+            throw e
         }
         return this
     }