Log web hook execution timeout events

If a web hook HTTP request is sent but no response comes
within a certain time (10s by default), the hook execution fails
and will be retried. This commit makes such timeouts visible
in the web hook log, like connection timeouts already are.

Also log "no route to host" errors.

app/services/web_hook_service.rb

@@ -44,7 +44,7 @@ class WebHookService
       http_status: response.code,
       message: response.to_s
     }
-  rescue SocketError, OpenSSL::SSL::SSLError, Errno::ECONNRESET, Errno::ECONNREFUSED, Net::OpenTimeout => e
+  rescue SocketError, OpenSSL::SSL::SSLError, Errno::ECONNRESET, Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Net::OpenTimeout, Net::ReadTimeout => e
     log_execution(
       trigger: hook_name,
       url: hook.url,

spec/services/web_hook_service_spec.rb

@@ -53,7 +53,7 @@ describe WebHookService, services: true do
     end
 
     it 'handles exceptions' do
-      exceptions = [SocketError, OpenSSL::SSL::SSLError, Errno::ECONNRESET, Errno::ECONNREFUSED, Net::OpenTimeout]
+      exceptions = [SocketError, OpenSSL::SSL::SSLError, Errno::ECONNRESET, Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Net::OpenTimeout, Net::ReadTimeout]
       exceptions.each do |exception_class|
         exception = exception_class.new('Exception message')