Fixes for issue 8 hanging on CDATA.

[boblodgett]

Description

This PR fixes DOTNET-7357 issue 8. Issue 8 XML Unmarshaller hangs forever for Test: SimpleScalarPropertiesWithXmlPreambleResponse

• (Review manual changes) commit 377f602 - Fixes for issue 8 hanging on CDATA.
• No generated changes for this manual change

MERGE into protocol-tests feature branch only

Builds on prior PR: #3242
Merge order: 5
Ticket: DOTNET-7357

Motivation and Context

Testing

N/A - the test cases are the protocol tests. A final dry-run will be done on the protocol-tests feature branch once everything is merged into the feature branch.

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have read the README document
• I have added tests to cover my changes
• All new and existing tests passed

License

• I confirm that this pull request can be released under the Apache 2 license