[explicit-resource-management] Remove invalid using tests within case clauses #4904
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Per rbuckton/ecma262#14, using declarations are not allowed if they are nested directly within the case clauses.
Since we already have a test on this case (https://github.com/tc39/test262/blob/061c0c3ccea8c6d98fa455370df022c572540c42/test/language/statements/using/syntax/using-invalid-switchstatement-caseclause.js), some tests in the staging folder become in conflict with it, and thus they should be removed. It is likely that they are sourced from an early V8 implementation which did not forbid using within case clause.