ENH: Remove the ITK_USE_CONCEPT_CHECKING option

[sbelsk]

Resolves #3775. These changes remove the ITK_USE_CONCEPT_CHECKING option in favor of always performing concept checking, since this option has been enabled by default for a while now.

PR Checklist

• No API changes were made (or the changes have been approved)
• No major design changes were made (or the changes have been approved)
• Added test (or behavior not changed)
• Updated API documentation (or API not changed)
• Added license to new files (if any)
• Added Python wrapping to new files (if any) as described in ITK Software Guide Section 9.5
• Added ITK examples for all new major features (if any)

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[dzenanz]

I did not look thoroughly, but it looks good.

[seanm]

What about ITK_USE_STRICT_CONCEPT_CHECKING?

[dzenanz]

That was already removed:

ITK/CMakeLists.txt

Line 505 in 524df2a

"Compilers requiring ITK_USE_STRICT_CONCEPT_CHECKING are no longer supported. This variable is no longer used.")

[seanm]

OK great! I noticed my cdash scripts had both, so I'll remove both from my scripts.