FEATURE: Site setting for blocking onebox of URLs that redirect (#16881)

Meta topic: https://meta.discourse.org/t/prevent-to-linkify-when-there-is-a-redirect/226964/2?u=osama.

This commit adds a new site setting `block_onebox_on_redirect` (default off) for blocking oneboxes (full and inline) of URLs that redirect. Note that an initial http → https redirect is still allowed if the redirect location is identical to the source (minus the scheme of course). For example, if a user includes a link to `http://example.com/page` and the link resolves to `https://example.com/page`, then the link will onebox (assuming it can be oneboxed) even if the setting is enabled. The reason for this is a user may type out a URL (i.e. the URL is short and memorizable) with http and since a lot of sites support TLS with http traffic automatically redirected to https, so we should still allow the URL to onebox.

lib/retrieve_title.rb

@@ -3,8 +3,12 @@
 module RetrieveTitle
   CRAWL_TIMEOUT = 1
 
-  def self.crawl(url)
-    fetch_title(url)
+  def self.crawl(url, max_redirects: nil, initial_https_redirect_ignore_limit: false)
+    fetch_title(
+      url,
+      max_redirects: max_redirects,
+      initial_https_redirect_ignore_limit: initial_https_redirect_ignore_limit
+    )
   rescue Exception => ex
     raise if Rails.env.test?
     Rails.logger.error(ex)
@@ -53,8 +57,14 @@ module RetrieveTitle
   end
 
   # Fetch the beginning of a HTML document at a url
-  def self.fetch_title(url)
-    fd = FinalDestination.new(url, timeout: CRAWL_TIMEOUT, stop_at_blocked_pages: true)
+  def self.fetch_title(url, max_redirects: nil, initial_https_redirect_ignore_limit: false)
+    fd = FinalDestination.new(
+      url,
+      timeout: CRAWL_TIMEOUT,
+      stop_at_blocked_pages: true,
+      max_redirects: max_redirects,
+      initial_https_redirect_ignore_limit: initial_https_redirect_ignore_limit
+    )
 
     current = nil
     title = nil