CI: Guard compile-time CPU features tests

  This guard protects against any sudden unexpected changes that may adversely
  affect the compile-time SIMD features detection which could leave the SIMD code
  inactivated. Until now we have faced two cases:

  1. Hardening the compile-time test files of Neon/ASIMD features without checking
     the sanity of the modification leading to disabling all optimizations on aarch64.
     see gh-21747

  2. A sudden compiler upgrades by CI side on s390x that causes conflicts with the
     installed assembler leading to disabling the whole VX/E features, which made us
     merge SIMD code without testing it. Later, it was discovered that this code
     disrupted the NumPy build.
     see gh-21750, gh-21748

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