UnitTestFrameworkPkg: Add CLANGDWARF and CLANGPDB support

Update host-based unit test [BuildOptions] to support
CLANGDWARF and CLANGPDB.

* Use CLANG specific code coverage options
* Map CLANG trap function to abort() to resolve link issues
  when building Google Test based unit tests. The default
  mapping from tools_def.txt is to an unresolved function
  to generate a build failure. Mapping to abort() overrides
  the default mapping. If a unit test introduces undefined
  behavior in a code path that is executed, then abort() is
  called and the unit test application exits with an error
  and fails the unit test.
* Update GCC to pass --coverage in link command so the
  linker automatically includes -lgcov. The explicit
  linking of -lgcov is removed.
* Add /EHs to all MSFT components instead of only components
  of type HOST_APPLICATION.
* Add CXX_FLAGS for all tool chain families. Use c++ 20 for
  MSFT and GCC and c++ 17 for clang. Clang generates errors
  compiling Google Test with c++ 20.
* Add -z noexecstack to all GCC builds to reduce warnings.
* Add UNIT_TESTING_CODE_COVERAGE_ENABLE that is enabled by
  default. Can be used to temporarily disable code coverage
  when debugging interactions between unit testing features.

Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>

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