Add navigation buttons to test coverage elements

[gjsjohnmurray]

Type: Feature Request

When viewing a file containing test coverage lines it could be useful to offer quick navigation to the Test Coverage view and to the test run tree of the Test Results view.

1. Click on the coverage bar in the Test Coverage Toolbar to reveal the Test Coverage view, which may currently be collapsed or invisible (e.g. in closed secondary side bar, or in view container that is hidden).
2. Add a "Results" button to the Test Coverage Toolbar that reveals the Test Results view if hidden, then focuses on the run whose coverage is currently open.
3. Add a "Results" button to the Test Coverage view's toolbar that reveals the Test Results view if hidden, then focuses on the run whose coverage is currently open.

VS Code version: Code - Insiders 1.90.0-insider (0cd8d6a, 2024-05-16T05:49:53.998Z)
OS version: Windows_NT x64 10.0.22631
Modes: