Observable Property used on a field with escaped name is not generating correctly

[GetGet99]

Describe the bug

Observable Property used on a field with an escaped name (the name starting with the @ sign such as @event @param @int) is not generating correctly.

Steps to reproduce

1. Create a project with the MVVM Toolkit installed
2. Add in this code snippet

[ObservableProperty]
double @event;

3. Type Event somewhere in a method and Ctrl + Click it to go to the definition
4. The output should look like this

/// <inheritdoc cref="event"/>
[global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator", "8.2.0.0")]
[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
public double Event
{
    get => event;
    set
    {
        if (!global::System.Collections.Generic.EqualityComparer<double>.Default.Equals(event, value))
        {
            OnEventChanging(value);
            OnEventChanging(default, value);
            OnPropertyChanging(global::CommunityToolkit.Mvvm.ComponentModel.__Internals.__KnownINotifyPropertyChangingArgs.Event);
            event = value;
            OnEventChanged(value);
            OnEventChanged(default, value);
            OnPropertyChanged(global::CommunityToolkit.Mvvm.ComponentModel.__Internals.__KnownINotifyPropertyChangedArgs.Event);
        }
    }
}

Expected behavior

Every single event in the generated code should be replaced with @event because event is treated as a C# keyword.

/// <inheritdoc cref="@event"/>
[global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator", "8.2.0.0")]
[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
public double Event
{
    get => @event;
    set
    {
        if (!global::System.Collections.Generic.EqualityComparer<double>.Default.Equals(@event, value))
        {
            OnEventChanging(value);
            OnEventChanging(default, value);
            OnPropertyChanging(global::CommunityToolkit.Mvvm.ComponentModel.__Internals.__KnownINotifyPropertyChangingArgs.Event);
            @event = value;
            OnEventChanged(value);
            OnEventChanged(default, value);
            OnPropertyChanged(global::CommunityToolkit.Mvvm.ComponentModel.__Internals.__KnownINotifyPropertyChangedArgs.Event);
        }
    }
}

Screenshots

IDE and version

VS 2022

IDE version

17.6.2

Nuget packages

• CommunityToolkit.Common
• CommunityToolkit.Diagnostics
• CommunityToolkit.HighPerformance
• CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

8.2.0

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