[tests] close some leaked Shells #2615

[jukzi]

#2615

[github-actions]

Test Results

 1 214 files   -   607   1 214 suites   - 607   1h 7m 45s ⏱️ - 27m 32s
 7 729 tests ±    0   7 497 ✅  -     3  232 💤 +  4  0 ❌  - 1 
16 232 runs   - 8 116  15 717 ✅  - 7 881  515 💤  - 234  0 ❌  - 1 

Results for commit 370470e. ± Comparison against base commit 4721af7.

This pull request skips 4 tests.

UiTestSuite org.eclipse.ui.tests.api.ApiTestSuite org.eclipse.ui.tests.api.WorkbenchPluginTest ‑ testGetImageRegistryFromAdditionalDisplay
org.eclipse.jface.tests.resources.FontRegistryTest ‑ multipleDisplayDispose
org.eclipse.jface.text.tests.contentassist.ContextInformationTest ‑ testContextInfo_hide_focusOut
org.eclipse.urischeme.internal.registration.TestUnitWinRegistry ‑ testWinRegistry

[jukzi]

Failed to execute goal org.eclipse.tycho:tycho-apitools-plugin:4.0.10:verify (verify) on project org.eclipse.ui.workbench: Execute ApiApplication failed: InvocationTargetException: Component 'Eclipse Workbench' in the baseline 'workspace' is disposed [main]: Component was disposed here [Worker-0: Updating plug-in dependencies] -> [Help 1]

[vogella]

Failed to execute goal org.eclipse.tycho:tycho-apitools-plugin:4.0.10:verify (verify) on project org.eclipse.ui.workbench: Execute ApiApplication failed: InvocationTargetException: Component 'Eclipse Workbench' in the baseline 'workspace' is disposed [main]: Component was disposed here [Worker-0: Updating plug-in dependencies] -> [Help 1]

#2603