Misleading test content

### Description

The test `itkNewTest.cxx`:
https://github.com/InsightSoftwareConsortium/ITK/blob/fd076e4db29144b56ff2a96a12baa263432daaab/Modules/Core/Mesh/test/itkNewTest.cxx#L22-L50
https://github.com/InsightSoftwareConsortium/ITK/blob/fd076e4db29144b56ff2a96a12baa263432daaab/Modules/Core/Mesh/test/itkNewTest.cxx#L67-L83

and the test `itkEqualTest.cxx`:
https://github.com/InsightSoftwareConsortium/ITK/blob/fd076e4db29144b56ff2a96a12baa263432daaab/Modules/Filtering/ImageIntensity/test/itkEqualTest.cxx#L248-L256

contain blocks that are not used/do not seem to fit into the purpose of the tests. Especially, in the case of the `itkNewTest.cxx` where an `itk::CellInterfaceVisitorImplementation` is instantiated and only check whether the smart pointer is not null. If that is the purpose of the test, it should be renamed to honor the purpose.

In the second case, the tests seem to serve the purpose of performing different comparisons using an arbitrary filter, and thus are placed in any given module having some filter classes, e.g.
https://github.com/InsightSoftwareConsortium/ITK/blob/fd076e4db29144b56ff2a96a12baa263432daaab/Modules/Filtering/ImageIntensity/test/itkGreaterTest.cxx

### Impact analysis

Although there is no impact to the design itself of ITK, the mentioned tests contain blocks that are misleading or do not serve a purpose. So ITK is shipping some code that does not serve a purpose.

### Expected behavior

Tests do not contain unused blocks, and honor their purpose.

Contrary to other tests that are self-describing, I believe that the `itkEqualTest.cxx` and its peers (`itkGreaterTest.cxx`, `itkLessTest.cxx`) should also contain some minimal description of their purpose.

### Actual behavior

The mentioned tests contain blocks that are misleading and do not serve a purpose.

### Versions

`master`.

### Additional Information

NA.