Replace SubstringOrRegexPattern with an IStringOrRegexMatcher

[jamescrosswell]

We have a better abstraction for this now:

sentry-dotnet/src/Sentry/SubstringOrRegexPattern.cs

Lines 5 to 10 in 34b5598

	// TODO: This class can be replaced with an implementation of IStringOrRegexMatcher in the next major version bump.
	/// <summary>
	/// Provides a pattern that can be used to match against other strings as either a substring or regular expression.
	/// </summary>
	[TypeConverter(typeof(SubstringOrRegexPatternTypeConverter))]
	public class SubstringOrRegexPattern

[bitsandfoxes]

Closed by #3566