Upgrade to 0.266.1 spawns dev_containers_target_stage which does not exist

The latest version of Dev Containers does not let me build a container from an external Dockerfile. This issue can be fixed be going to an older version of the Dev Containers extension. From my investigation, I have noticed that the docker build command is failing as it is setting the --target to dev_containers_target_stage. In my Dockerfile this target is named as 'dev'. The failing command is also spawning a build arg of _DEV_CONTAINERS_BASE_IMAGE=dev which also does not exist in my Dockerfile.

Before this I was using remote-container extension v0.251.0 where everything worked fine. Not sure if this is a bug, or some major changes have been made to how Dev Containers now run on a newer version.

• VSCode Version: 1.73.1
• Local OS Version: Windows_NT x64 10.0.19044
• Remote OS Version: Red Hat Enterprise Linux Server release 7.9 (Maipo)
• Remote Extension/Connection Type: SSH into Linux and then run Dev Containers
• Logs: Logs.txt

Steps to Reproduce:

1. Set "build" "target" to "dev" in the devcontainer.json
2. Create a multi-stage Dockerfile with a stage called "dev" (this is what we want to invoke for the Remote Container)

Does this issue occur when you try this locally?: No
Does this issue occur when you try this locally and all extensions are disabled?: No