don't show key binding in UI when command is not handled or not enabled

[tobiasmelcher]

No description provided.

[github-actions]

Test Results

 1 214 files   -   607   1 214 suites   - 607   1h 10m 42s ⏱️ - 27m 29s
 7 729 tests ±    0   7 495 ✅  -     5  233 💤 +  5  1 ❌ +1 
16 232 runs   - 8 116  15 716 ✅  - 7 882  515 💤  - 234  1 ❌ +1 

For more details on these failures, see this check.

Results for commit ae2513e. ± Comparison against base commit 6957472.

This pull request skips 5 tests.

org.eclipse.ui.genericeditor.tests.HoverTest ‑ testEnabledWhenHover
org.eclipse.ui.genericeditor.tests.HoverTest ‑ testMultipleHover
org.eclipse.ui.genericeditor.tests.HoverTest ‑ testProblemHover
org.eclipse.ui.genericeditor.tests.HoverTest ‑ testSingleHover
org.eclipse.ui.genericeditor.tests.ShowInformationTest ‑ testInformationControl

[BeckerWdf]

failed test is unrelated