Prune extra decoded children that should stay on the type definition only.

[mrsuciu]

Keep the generated children that belong on instances, and prune the extra decoded children that should stay on the type definition only, such as Optional/Mandatory placeholders and ones that do not have Mandatory/Optional ModellingRules.

Description

Currently child nodes that are type definition detailes such as ones that do not have Mandatory/Optional ModellingRules are instantiated in the runtime instance of such type definitions. This PR proposes to correct this behaviour during NodeState creation as an alternative from it being fixed by the ModelCompiler.

Related Issues

• Fixes ProgramStateMachineState has wrong InitializationString and possible many other classes also #3770

Checklist

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• I have signed the CLA and read the CONTRIBUTING doc.
• I have added tests that prove my fix is effective or that my feature works and increased code coverage.
• I have added all necessary documentation.
• I have verified that my changes do not introduce (new) build or analyzer warnings.
• I ran all tests locally using the UA.slnx solution against at least .net framework and .net 10, and all passed.
• I fixed all failing and flaky tests in the CI pipelines and all CodeQL warnings.
• I have addressed all PR feedback received.