Error in frank framework when using frank-doc

We need a test that verifies that changes in the frank doc actually produce a valid XSD, to avoid that everything in the frank-doc is valid and green and it fails in the framework.

Current messages:
```
02:40:19 [ERROR] ConfigWarningTest.testConfigWarning:28 » Configuration error loading configuration: (IOException) cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]: (SAXParseException) SystemId [file:/home/jenkins/agent/workspace/ff-ci_pr_PR-10760/core/target/classes/xml/xsd/FrankConfig-compatibility.xsd] line [2321] column [55]: src-resolve: Cannot resolve the name 'JMSFacadeCumulativeChildGroup' to a(n) 'group' component.
02:40:19 [ERROR] ConfigurationDigesterTest.testDigestConfigWithOldNamespace:214 » IO cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]
02:40:19 [ERROR] ConfigurationDigesterTest.testFixedValueAttributeResolverWithFrankConfig:186 » SAXParse src-resolve: Cannot resolve the name 'JMSFacadeCumulativeChildGroup' to a(n) 'group' component.
02:40:19 [ERROR] ConfigurationDigesterTest.testLegacyClassNameRewriter:127 » IO cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]
02:40:19 [ERROR] ConfigurationDigesterTest.testMultipleConfigurationElements:148 » IO cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]
02:40:19 [ERROR] ConfigurationDigesterTest.testNewCanonicalizer:53 » IO cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]
02:40:19 [ERROR] ConfigurationDigesterTest.testNewConfigurationPreParser:78 » IO cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]
02:40:19 [ERROR] ConfigurationDigesterTest.testStubbing4TestTool:105 » IO cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]
02:40:19 [ERROR] IncludePipelinePartTest.testConfigWarning:25 » Configuration error loading configuration: (IOException) cannot get canonicalizer using [/xml/xsd/FrankConfig-compatibility.xsd]: (SAXParseException) SystemId [file:/home/jenkins/agent/workspace/ff-ci_pr_PR-10760/core/target/classes/xml/xsd/FrankConfig-compatibility.xsd] line [2321] column [55]: src-resolve: Cannot resolve the name 'JMSFacadeCumulativeChildGroup' to a(n) 'group' component.
02:40:19 [ERROR] ValidateAttributeRuleTest.testSuppressDeprecationWarningsForAllAdapters:572 » IllegalState unable to configure configuration
02:40:19 [ERROR] ValidateAttributeRuleTest.testSuppressDeprecationWarningsForSomeAdapters:509 » IllegalState unable to configure configuration
02:40:19 [ERROR] ValidateAttributeRuleTest.testSuppressDeprecationWarningsWithLocationInfo:538 » IllegalState unable to configure configuration
```