Fix tasks status incorrect #163393

[mustard-mh]

Fixes #163393

How to Test

Open vscode with source with tasks.json defined like below, tasks status should be correct after task is done

(Use cmd+shift+b to start task)

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "echo11",
            "type": "shell",
            "command": "${workspaceFolder}/a.sh",
            "presentation": {
                "echo": true,
                "reveal": "always",
                "focus": false,
                "panel": "new",
                "showReuseMessage": true,
                "clear": false
            },
            "problemMatcher": [],
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "echo11",
            "type": "shell",
            "command": "${workspaceFolder}/a.sh",
            "presentation": {
                "echo": true,
                "reveal": "always",
                "focus": false,
                "showReuseMessage": true,
                "clear": false
            },
            "problemMatcher": [],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "runOptions": {
                "instanceLimit": 3
            }
        }
    ]
}

File a.sh can be like

echo hello
sleep 3

[mustard-mh]

@microsoft-github-policy-service agree

[mustard-mh]

@microsoft-github-policy-service agree

[mustard-mh]

Updated, see diff here, and local integration test passed

[jeanp413]

cc @meganrogge

[meganrogge]

Thanks for working on this 👍🏼