Test: Support SGR ANSI escape sequences in TestRun.appendOutput API

[connor4312]

Refs: #151964

• anyOS @lszomoru
• anyOS @joyceerhl

Complexity: 3

Authors: @connor4312 @Tyriar

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This month, the output for tests in the Test Results panel is shown in a real terminal instead of a text editor. This means things like terminal colors will now work, where previously their colors were stripped.

• Use the VS Code selfhost test provider
• Run some tests. Run the "show test output" action
• Verify output is correctly shown in the Test Results view with colors.
• Add a console.log to a test. Verify you can switch between the log message in the Test Results' tree view, and the output via the inline ation
• Verify the tree view actions in general make sense and that scrolling and copying work in the terminal as expected
• Make a test fail, then do the same thing for the inline "Test: Peek Output" view (this vie wis only visible with one or more failing tests)