Merge topic 'default_extensions'

4a0485be7f cmStandardLevelResolver: Avoid unnecessary flags, fix unset level logic
29e2b85171 Tests: Simplify RunCMake.CompileFeatures introspection
fc3a1cbdd8 CompilerID: Compiler extensions default detection
2adfd95d79 CompilerID: Rename language_dialect to language_standard
00055d7779 Help: Document CMAKE_<LANG>_STANDARD_DEFAULT
a65bee4cfc Help: Document HIP standard/extensions properties and variables
a40ff1bb5a Help: Make language standard/extensions variable pages less wordy
3feff8379b Help: Generic language standard and extension variables documentation

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6177