Add test like AllDefinitionsSchemaValidationTest for ksml-runner.yaml examples

[KasparMetsa]

• AllDefinitionsSchemaValidationTest tests that all example KSML definitions pass the validation of ksml-language-spec.json schema

• We need a similar test for all ksml-runner.yaml examples to check if they pass the validation of ksml-runner-spec.json as was done in Add Schema Validation for ksml-runner.yaml #369

We need to test ksml-runner.yaml files validation at least in these locations:

• /Users/km/dev/ksml/ksml/src/test/resources/docs-examples
• /Users/km/dev/ksml/ksml-integration-tests/src/test/resources/docs-examples
• /Users/km/dev/ksml/examples

There are problems with circular dependency currently. Here are ideas how to solve it: #391 (comment)

• Also check that configuration reference doc matches the generated schema and Improve either the schema or the conf reference docs.