Make Search automatically redirect HTTP requests to HTTPS

[agr]

Search part of the #3795.

[agr]

Search statistics regarding HTTP usage:

We are getting ~100-150K HTTP requests each day. Almost all of them are GET requests and thus unaffected.

We do receive less than 10 of POST requests each day and occasional attempts to use other HTTP methods including random ones like "ABCD"

requests
| extend verb = tostring(split(name, " ")[0])
| where url !startswith "https" and timestamp > ago(30d)
| summarize sum(itemCount) by verb, bin(timestamp, 1d)
| order by timestamp desc, verb asc