Remove long deprecated and unused keybinding API

[akurtakov]

Deprecated for long time and creates way too many new deprecation warnings because of
https://eclipse.dev/eclipse/markdown/?f=news/4.38/jdt.md#changes-concerning-deprecation-warnings .

[vogella]

Thanks for working on this, IIRC I tried already multiple times to delete these but always had issues during the deletion. Will be nice to see these finally gone.

[github-actions]

Test Results

 3 012 files   -  6   3 012 suites   - 6   2h 10m 10s ⏱️ - 5m 53s
 8 242 tests  -  7   7 994 ✅  -  7  248 💤 ±0  0 ❌ ±0 
23 646 runs   - 21  22 855 ✅  - 21  791 💤 ±0  0 ❌ ±0 

Results for commit 3e03b71. ± Comparison against base commit 83d9313.

This pull request removes 7 tests.

UiTestSuite KeysTestSuite Bug42035Test ‑ testCtrl
UiTestSuite KeysTestSuite Bug42035Test ‑ testCtrlEnter
UiTestSuite KeysTestSuite Bug42035Test ‑ testCtrlM
UiTestSuite KeysTestSuite Bug42035Test ‑ testCtrlShift2
UiTestSuite KeysTestSuite Bug42035Test ‑ testCtrlShift7_SwissGerman
UiTestSuite KeysTestSuite Bug42035Test ‑ testCtrlShift7_US
UiTestSuite KeysTestSuite Bug43800Test ‑ testTruncatingCast

♻️ This comment has been updated with latest results.

[akurtakov]

All seems good now. Merging and starting a new I-build to verify it.

[akurtakov]