feat(misconf): support https_traffic_only_enabled in Az storage account

[nikpivkin]

Description

This PR adds support for the https_traffic_only_enabled attribute in Azure Storage Accounts, which replaces the older enable_https_traffic_only.

A small improvement is also included: a new Block.GetFirstAttributeOf method that returns the first existing attribute from the provided list. This helps eliminate boilerplate such as:

if attr := resource.GetAttribute("https_traffic_only_enabled"); attr.IsNotNil() { 
  account.EnforceHTTPS = attr.AsBoolValueOrDefault(true, resource) 
} else if attr := resource.GetAttribute("enable_https_traffic_only"); attr.IsNotNil() { 
  account.EnforceHTTPS = attr.AsBoolValueOrDefault(true, resource) 
}

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).