Write some tests that enforce that disabled_error_codes and enabled_error_codes do not affect program behavior #20396
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While disabled_error_codes and enabled_error_codes are internal fields in the options class, they cannot be set externally, unlike their peers. These tests ensure this intended behavior is maintained. Closes #12394, which failed to understand this.
Some of these tests have to be in cmdline.test because they error so badly that they break check-flags.test (they exit with 2 and print to stderr instead, which apparently check-flags.test can't handle; cf #19554).