Only require sentry-rails if Rails is defined

Without this non Rails app will get a warning each time they initialise. For example, Search API has: ``` W, [2022-03-10T09:45:26.609711 #11663] WARN -- sentry: ** [Sentry] sentry-rails can't detect Rails.logger. it may be caused by misplacement of the SDK initialization code ```
alphagov · Apr 4, 2022 · a10fceb · a10fceb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# Unreleased
+
+- Prevent sentry-rails logger warnings when govuk_error is used with non-Rails apps
+
 # 4.4.3
 
 - Update prometheus exporter server to 0.0.0.0 from localhost  ([#227](https://github.com/alphagov/govuk_app_config/pull/227)).

diff --git a/lib/govuk_app_config/govuk_error.rb b/lib/govuk_app_config/govuk_error.rb
@@ -1,5 +1,5 @@
 require "sentry-ruby"
-require "sentry-rails"
+require "sentry-rails" if defined?(Rails)
 require "govuk_app_config/govuk_statsd"
 require "govuk_app_config/govuk_error/configuration"
 require "govuk_app_config/version"