Add Missing API: HttpContext.ClearError

[Clounea]

Summary

When I try the IHttpModule and HttpApplication in the adapter, I found that HttpContext.ClearError is used in my module(in Sharepoint Online) but it is not supported.

Motivation and goals

HttpContext.ClearError is used in my module(in Sharepoint Online) but it is not supported. I wonder if there is plan to support the API.

In scope

HttpContext.ClearError

Usage example:

context.Response.Clear();
context.ClearError();
context.Response.Output.Write(" <div>error</div>" )
context.Response.End();

[joperezr]

Discussed during triage, seems like we should make this one be a no-op