Migrate JFace viewers and label providers tests to JUnit 5

[vogella]

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[github-actions]

Test Results

 1 996 files  +   990   1 996 suites  +990   51m 3s ⏱️ - 9m 24s
 6 501 tests  -  1 764   6 394 ✅  -  1 575   41 💤  - 255   9 ❌ + 9   57 🔥 + 57 
18 320 runs  +10 442  17 965 ✅ +10 381  166 💤  - 128  18 ❌ +18  171 🔥 +171 

For more details on these failures and errors, see this check.

Results for commit 8d19eb0. ± Comparison against base commit 4ba0593.

This pull request removes 1865 and adds 101 tests. Note that renamed tests count towards both.

AllTests AllViewersTests CComboViewerTest ‑ testInsertChild
AllTests AllViewersTests ComboViewerTest ‑ testInsertChild
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckAllElements
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckElement
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckProviderInvoked
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckProviderUpdate
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckProviderWithFilter
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckProviderWithSorter
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckedFalseGrayedFalse
AllTests AllViewersTests DeprecatedConstructor ‑ testCheckedFalseGrayedTrue
…

AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckAllElements
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckElement
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckProviderInvoked
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckProviderUpdate
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckProviderWithFilter
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckProviderWithSorter
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckedFalseGrayedFalse
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckedFalseGrayedTrue
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckedTrueGrayedFalse
AllTests AllViewersTests CheckboxTableViewerTest$DeprecatedConstructor ‑ testCheckedTrueGrayedTrue
…