chore(cloudfront): Add trustedSigners to V2. (#19839)

Some services still use the deprecated `trustedSigners` property, which is preventing teams which depend on those services from upgrading to V2. This change adds `trustedSigners` back into V2, but leaves it marked as `@deprecated`. 

Closes #19837

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

deprecated_apis.txt

@@ -754,7 +754,6 @@ constructs.Node#uniqueId
 @aws-cdk/aws-cloudfront.AliasConfiguration#names
 @aws-cdk/aws-cloudfront.AliasConfiguration#securityPolicy
 @aws-cdk/aws-cloudfront.AliasConfiguration#sslMethod
-@aws-cdk/aws-cloudfront.Behavior#trustedSigners
 @aws-cdk/aws-cloudfront.CloudFrontWebDistribution#domainName
 @aws-cdk/aws-cloudfront.CloudFrontWebDistributionProps#aliasConfiguration
 @aws-cdk/aws-cloudfront.GeoRestriction#blacklist