Transition control of tasks

[meganrogge]

• fix task bugs such as Multi-root Workspace Folders Are Not Honored for Tasks' Terminal Instances #147173
• code walkthrough
• any sections that could use attention/ refactoring?

[Tyriar]

• 💪 Reconnect in tasks Support reconnect in tasks #117408
• Add appropriate unit tests when refactoring/learning codebase
• Look for opportunities to share code with terminal