fix: stop erroneously conflating shared config profile names and IMDS profile names (#1671)

Author: ianbotsf

.changes/28142253-648c-44bf-a474-119a7b97d3be.json

@@ -0,0 +1,5 @@
+{
+    "id": "28142253-648c-44bf-a474-119a7b97d3be",
+    "type": "bugfix",
+    "description": "Stop erroneously using `ProfileCredentialsProvider.profileName` to initialize IMDS instance profile"
+}

aws-runtime/aws-config/common/src/aws/sdk/kotlin/runtime/auth/credentials/ProfileCredentialsProvider.kt

@@ -106,7 +106,6 @@ public class ProfileCredentialsProvider @InternalSdkApi constructor(
     private val namedProviders = mapOf(
         "Environment" to EnvironmentCredentialsProvider(platformProvider::getenv),
         "Ec2InstanceMetadata" to ImdsCredentialsProvider(
-            profileOverride = profileName,
             client = lazy {
                 ImdsClient {
                     platformProvider = this@ProfileCredentialsProvider.platformProvider