fix issue where bastion ip config name wasnt marshalled to json

[DanielMabbett]

• The purpose of this PR is explained in this or a referenced issue.

This shall marshal the "Name" property for the &[]network.BastionHostIPConfiguration{}

• [x ] The PR does not update generated files.
  • These files are managed by the codegen framework at Azure/autorest.go.
• [x ] The PR targets the latest branch.
• Tests are included and/or updated for code changes.
  I can't
• Updates to CHANGELOG.md are included.
• [ x] Apache v2 license headers are included in each file.

[azuresdkci]

Can one of the admins verify this patch?

[jhendrixMSFT]

Hello! The SDK content is auto-generated from swagger files, so the swagger must be updated else this change will be lost. I've opened issue Azure/azure-rest-api-specs#6608 to track this, if you have any additional information on this can you please add it there? Thanks!