feat: set context during rails error report (#649)

This will always set the context from Rails when an error is reported
even if it is not handled. This will allow applications to use
`Rails.error.set_context` instead of `Honeybadger.context` and still see
that context in errors in the UI.

It would have been nice if Rails provided an event for when
`set_context` is called so that we can hook into that, but this should
be ok for now.

lib/honeybadger/plugins/rails.rb

@@ -32,6 +32,8 @@ def render_exception(arg, exception, *args)
 
       class ErrorSubscriber
         def self.report(exception, handled:, severity:, context: {}, source: nil)
+          Honeybadger.context(context)
+
           # We only report handled errors (`Rails.error.handle`)
           # Unhandled errors will be caught by our integrations (eg middleware),
           # which have richer context than the Rails error reporter
@@ -41,7 +43,7 @@ def self.report(exception, handled:, severity:, context: {}, source: nil)
 
           tags = ["severity:#{severity}", "handled:#{handled}"]
           tags << "source:#{source}" if source
-          Honeybadger.notify(exception, context: context, tags: tags)
+          Honeybadger.notify(exception, tags: tags)
         end
 
         def self.source_ignored?(source)