Revert "Fix error popups when class extends itself"

[mickaelistria]

Reverts #978
It causes some false errors to be reported while building sprint-petclinic.

[github-actions]

Test Results

     8 files  ±    0       8 suites  ±0   19m 51s ⏱️ + 1m 43s
72 851 tests  - 5 346  72 835 ✅  - 5 360  0 💤 ±0  1 ❌  - 1  15 🔥 +15 
72 905 runs   - 5 352  72 889 ✅  - 5 366  0 💤 ±0  1 ❌  - 1  15 🔥 +15 

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

Results for commit 0b68c22. ± Comparison against base commit 7cbf75d.

This pull request removes 5361 and adds 15 tests. Note that renamed tests count towards both.

org.eclipse.jdt.core.tests.compiler.CharDeduplicationTest ‑ testAll
org.eclipse.jdt.core.tests.compiler.CharDeduplicationTest ‑ testDeduplication
org.eclipse.jdt.core.tests.compiler.CharDeduplicationTest ‑ testDeduplicationMid
org.eclipse.jdt.core.tests.compiler.CharDeduplicationTest ‑ testDeduplicationTableSize
org.eclipse.jdt.core.tests.compiler.CharDeduplicationTest ‑ testMultithreaded
org.eclipse.jdt.core.tests.compiler.DeduplicationUtilTest ‑ testDeduplication
org.eclipse.jdt.core.tests.compiler.IrritantSetTest ‑ testGroup4
org.eclipse.jdt.core.tests.compiler.map.CharArrayMapperTest ‑ testCharArrayHashMap
org.eclipse.jdt.core.tests.compiler.map.CharArrayMapperTest ‑ testCharArrayMap
org.eclipse.jdt.core.tests.compiler.map.CharArrayMapperTest ‑ testCharDelegateMap
…

org.eclipse.jdt.core.tests.RunAllJdtModelTestsTracing ‑ Unknown test
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ClasspathTests
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ExistenceTests
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ExternalJarDeltaTests
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.JavaElementDeltaTests
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ResolveTests
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ResolveTests10
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ResolveTests12To15
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ResolveTests18
org.eclipse.jdt.core.tests.model.SuiteOfTestCases$Suite ‑ org.eclipse.jdt.core.tests.model.ResolveTests2
…