Mark deprecated and unsupported constants for deletion in

[vogella]

IWorkbenchPreferenceConstants

Also remove initialization of unsupported preference values

[github-actions]

Test Results

 1 214 files   -   607   1 214 suites   - 607   1h 20m 52s ⏱️ - 23m 4s
 7 728 tests ±    0   7 495 ✅  -     5  233 💤 +  5  0 ❌ ±0 
16 230 runs   - 8 115  15 716 ✅  - 7 882  514 💤  - 233  0 ❌ ±0 

Results for commit 4de3c17. ± Comparison against base commit f0e5533.

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

♻️ This comment has been updated with latest results.

[vogella]

Linux fail: #2603