Declare variables close to where they are used in tests and initialize
them at declaration.

Declare and use image dimensionality as a constant expression in
miscellaneous tests instead of hard-coding the value across different
statements.

Do not declare a test status variable that is only used once: prefer
using directly the appropriate return value.

Allow `itkCellInterfaceTest` to run as long as possible: store the check
status value in a variable and return such value at the end of the test.
Conform to the ITK SWG guidelines by doing so.

Use exception checking macros in `itkVectorExpandImageFilterTest.cxx`:
- Use the `ITK_TRY_EXPECT_EXCEPTION` macro to check expected exceptions
  when updating filters in lieu of `try/catch` blocks for the sake of
  readability and compactness, and to save typing/avoid boilerplate
  code.
- Only place the code that might raise exceptions within the macro.
- Change the test status variable type to accomodate for the changes
  above.

Prefer setting the input once all ivars have been set in
`itkPatchBasedDenoisingImageFilterDefaultTest.cxx`.