Actions: Exclude model-generator queries from query suites

This change removes the model generator queries for Actions
sources/sinks/summaries from being run as part of the
`actions-security-and-quality.qls` query suite,
where they were accidentally included.

All languages will now exclude both `modelgenerator`
and `model-generator` tagged queries from their suites.

misc/suite-helpers/security-and-quality-selectors.yml

@@ -33,3 +33,4 @@
     tags contain:
       - modeleditor
       - modelgenerator
+      - 'model-generator'