Add [GeneratedRegex] properties

[jamescrosswell]

We've got lots of regexes defined as properties, with backing methods specifically because we had to use methods to leverage the source generated regexes. For example:

sentry-dotnet/src/Sentry/Internal/OriginHelper.cs

Lines 8 to 18 in 3e70c31

	#if NET8_0_OR_GREATER
	[GeneratedRegex(ValidOriginPattern, RegexOptions.Compiled)]
	private static partial Regex ValidOriginRegEx();
	private static readonly Regex ValidOrigin = ValidOriginRegEx();
	#else
	private static readonly Regex ValidOrigin = new (ValidOriginPattern, RegexOptions.Compiled);
	#endif
	public static bool IsValidOrigin(string? value) => value == null || ValidOrigin.IsMatch(value);
	internal static string? TryParse(string origin) => IsValidOrigin(origin) ? origin : null;

We should be able to tidy that code up now that [GeneratedRegex] can also be added to properties.