ci: split SDK registry upload into independent targets

The monolithic upload-to-sdk-registry target ran private, private
ndk27, and public uploads sequentially in a single make invocation.
If any module failed (e.g. artifacts already in S3 from a previous
attempt), make stopped and the remaining groups never uploaded.

Split into three Makefile targets (upload-to-sdk-registry-private,
upload-to-sdk-registry-private-ndk27, upload-to-sdk-registry-public)
and call each as a separate workflow step with its own error
handling. A re-run after a partial failure now skips the groups
that already succeeded and continues with the rest.

(cherry picked from commit 88e88496ea8fd466709f9040ea1593c9b9b449c4)

GitOrigin-RevId: 514abfa7ac6d8ad11a9bdfc6bffdb4f988304a9c

Author: temap

Makefile

@@ -206,8 +206,8 @@ upload-to-sdk-registry-snapshot:
 
 .PHONY: upload-to-sdk-registry
 upload-to-sdk-registry:
-	./gradlew mapboxSDKRegistryUpload $(if $(VERSION_NAME),-PVERSION_NAME=$(VERSION_NAME),)
-	./gradlew mapboxSDKRegistryUpload $(if $(VERSION_NAME),-PVERSION_NAME=$(VERSION_NAME),) -PndkMajor=27
+	./gradlew mapboxSDKRegistryUpload --continue $(if $(VERSION_NAME),-PVERSION_NAME=$(VERSION_NAME),)
+	./gradlew mapboxSDKRegistryUpload --continue $(if $(VERSION_NAME),-PVERSION_NAME=$(VERSION_NAME),) -PndkMajor=27
 
 .PHONY: publish-to-sdk-registry
 publish-to-sdk-registry: