[BUG] expect_columns_equivalent handles infinity incorrectly.

[cwharris]

Describe the bug
When comparing any floating point value with (+/-) infinity, expect_columns_equivalent indicates the values are equivalent.

Steps/Code to reproduce bug

auto inf = std::numeric_limits<double>::infinity();
auto a = fixed_width_column_wrapper<double>({inf, inf, inf, inf});
auto b = fixed_width_column_wrapper<double>({0, 1, -1, -inf});
expect_columns_equivalent(a, b); // passes

Expected behavior
Any of these should fail:

auto inf = std::numeric_limits<double>::infinity();
auto inf_col =   cudf::test::fixed_width_column_wrapper<double>({inf});
expect_columns_equivalent(inf_col, fixed_width_column_wrapper<double>({0}));
expect_columns_equivalent(inf_col, fixed_width_column_wrapper<double>({1}));
expect_columns_equivalent(inf_col, fixed_width_column_wrapper<double>({-1}));
expect_columns_equivalent(inf_col, fixed_width_column_wrapper<double>({-inf}));

All of these should pass:

auto inf = std::numeric_limits<double>::infinity();
auto inf_col =   cudf::test::fixed_width_column_wrapper<double>({inf});
auto neg_inf_col =   cudf::test::fixed_width_column_wrapper<double>({-inf});
expect_columns_equivalent(inf_col, fixed_width_column_wrapper<double>({inf}));
expect_columns_equivalent(neg_inf_col, fixed_width_column_wrapper<double>({-inf}));

Additional Context
expect_columns_equal behaves as expected.

[github-actions]

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[jrhemstad]

I think @ttnghia fixed that already here: #7410

[ttnghia]

Yeah, I just tested the examples above. All passed with my fix. This can be closed when #7410 is merged.