At the moment some schematics contain this options for instance the `guard`, `component` etc.. But some others don't such as `module`
Fixes#12894 and Fixes#6272
This aligns options that do the same thing:
1) `skipSpecs` and `spec` has been deprecated in favor of `skipTests`.
2) `styleext` has been deprecated in favor of `style` since the latest is two words.
Fixes#12784