CTestConfig: Remove unused variables

Daniel Pfeiferrequested to merge
purpleKarrot/kwsys:ctestconfig-cleanup into master

Warning: To my knowledge, CTEST_SUBMIT_URL requires CMake version 3.14. KWSys defines the minimum required version as 3.13. If it is expected that dashboard clients may use version 3.13, it may make sense to hold back this MR until the minimum required version is increased to at least 3.14.

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