Case-sensitivity when opting out of VSCode extensions

[YoanMCN]

• VSCode Version: 1.94.1
• Local OS Version: macOS 14.2
• Remote OS Version: Debian GNU/Linux 11 (bullseye)
• Remote Extension/Connection Type: Containers

Steps to Reproduce:

1. Add a feature that installs an extension in the devcontainer.json file, for example, the aws-cli feature:

"features": {
    "ghcr.io/devcontainers/features/aws-cli:1": {}
}

2. Opt out of the extension using the following configuration:

"customizations": {
    "vscode": {
        "extensions": [
            "-amazonwebservices.aws-toolkit-vscode"
        ]
    }
}

Issue:

After launching the container, the extension is still present. In the feature, the extension's ID is written with uppercase letters: "AmazonWebServices.aws-toolkit-vscode". To make it work, you need to write it with the same casing:

"customizations": {
    "vscode": {
        "extensions": [
            "-AmazonWebServices.aws-toolkit-vscode"
        ]
    }
}

This should not be necessary. The check should not be case-sensitive.