Broken variable substitution in `swift` type of task in "task.json"

[Whotakesmyname]

Describe the bug
Variable substitution is broken in swift type of task in "task.json"

To Reproduce
Steps to reproduce the behavior:

1. Go to 'task.json'
2. Add an argument e.g. "${cwd}" in args section of the task of type swift
3. Run the task
4. See in the terminal output, ${cwd} is printed out without being executed.

Expected behavior
In VSCode documentation, it noted

only command, args, and options support variable substitution.

So args section in task.json should expand ${variable}s.

Environment

• OS: MacOS14
• Swift swift lang-6.0.2.1.2
• Visual Studio Code version: 1.94.2
• vscode-swift version: v1.11.3

Additional context
N/A

[matthewbastien]

Verified with 8a05ead