Fixed an edge-case bug when reading getter for enum value, updates XObjectsCodeGen version

[mamift]

• Fixes a bug which threw an exception when accessing the property getter for an element or attribute whose type is an enum type where the enum value shares the same name with a C# keyword, and thus the string value (ToString) returns a word prefixed with the '@' symbol.
• Fixes an issue with publishing new XObjectsCodeGen nuget releases.

v3.4.15

[Copilot]

Pull request overview

This PR addresses an enum parsing edge case in the runtime services where enum facet mappings may return C#-escaped member names (prefixed with @), and updates project/package versioning and release notes for the 3.4.15 release.

Changes:

• Adjust enum facet member parsing to strip a leading @ before enum parsing (keyword-escaped enum identifiers).
• Add/rename NUnit tests covering enum keyword cases and clarify a configuration test name.
• Centralize/align versioning for XObjectsCodeGen and bump repo version + release notes to 3.4.15.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
XObjectsTests/WssApiUseTests.cs	Adds new tests targeting enum values that clash with C# keywords (e.g., @false).
XObjectsTests/LinqToXsdConfigurationTests.cs	Renames a test to better reflect the enum/keyword scenario.
XObjectsCore/API/XTypedServices.cs	Updates enum facet parsing logic to handle keyword-escaped enum member names.
XObjectsCode/XObjectsCodeGen.csproj	Removes hardcoded package version to rely on central versioning.
Version.props	Bumps the repository version to 3.4.15.
RELEASENOTES.md	Adds release notes entry for 3.4.15.

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