Interceptors should not access TransactionManager

With ISPN-5469, we are no longer executing all the interceptor on the user thread, even on the originator. That means trying to read the thread-local transaction with TransactionManager.getTransaction() sometimes won't work, so interceptors should avoid it.

E.g. InvocationContextInterceptor.markTxForRollbackAndRethrow() wants to rollback the current transaction but doesn't find any transaction bound to the current thread, causing failures in PessimisticTxPartitionAndMergeDuringRuntimeTest.