AutoRest throws when `profile` parameters in content type

[rossgrambo]

Before filling a bug

• [Y] have you checked the faq for known issues.
• [Y] have you checked existing issues

AutoRest C# appears to not handle profile parameters in content type. Profile is valid since RFC6906

[.Net] System.NotSupportedException: Content type application/json;profile="https://azconfig.io/mime-profiles/feature-management/ff"​;charset=utf-8 is not supported. The unsupported member type is located on type 'AutoRest.CSharp.Common.Input.InputNamespace'. Path: $ | LineNumber: 22680 | BytePositionInLine: 15.

Expected behavior
No error is thrown and application/json is used if the profile isn't resolved.

Additional context
This is happening in builds from https://github.com/Azure/azure-rest-api-specs-pr/pull/21305. Can link a specific build if it's valuable.