Add boolean to default mappings.

- add tests for boolean case
- expose default mappings in TestUtils
- fix problem with resolving grammar files too early
4 jobs for 17-missing-default-mapping-for-boolean in 6 minutes and 39 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build #19317

00:01:26

 
  Test
passed test #19318

00:05:13

 
  Ragdoc Build
passed ragdoc_build #19319

00:00:22

 
  Ragdoc View
passed ragdoc_view #19320

00:02:23