Migrate CloseTestWindowsRule to JUnit 5 and migrate all related tests#3502

vogella wants to merge 2 commits intoeclipse-platform:mastereclipse-platform/eclipse.platform.ui:masterfrom

vogella:claude/migrate-close-test-windows-junit5-011CUoYrLHyBx1eCmsjFE2QVvogella/eclipse.platform.ui:claude/migrate-close-test-windows-junit5-011CUoYrLHyBx1eCmsjFE2QVCopy head branch name to clipboard