Clear Sentry and Raven settings after the related tests

When we setup Sentry/Raven, we don't clear their settings.
And this causes some flaky tests.

In this commit, we are adding the new `clear_sentry_settings` method.

Related https://gitlab.com/gitlab-org/gitlab/-/issues/432145

spec/lib/gitlab/error_tracking_spec.rb

@@ -76,7 +76,7 @@
   end
 
   after do
-    Sentry.get_current_scope.clear
+    clear_sentry_settings
   end
 
   describe '.track_and_raise_for_dev_exception' do

spec/lib/gitlab/http_spec.rb

@@ -55,8 +55,7 @@
       end
 
       context 'when there is a DB call in the concurrent thread' do
-        it 'raises Gitlab::Utils::ConcurrentRubyThreadIsUsedError error',
-          quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/432145' do
+        it 'raises Gitlab::Utils::ConcurrentRubyThreadIsUsedError error' do
           stub_request(:get, 'http://example.org').to_return(status: 200, body: 'hello world')
 
           result = described_class.get('http://example.org', async: true) do |_fragment|

spec/requests/api/helpers_spec.rb

@@ -320,6 +320,10 @@ def set_param(key, value)
       Gitlab::ErrorTracking.configure
     end
 
+    after do
+      clear_sentry_settings
+    end
+
     it 'does not report a MethodNotAllowed exception to Sentry' do
       exception = Grape::Exceptions::MethodNotAllowed.new({ 'X-GitLab-Test' => '1' })
       allow(exception).to receive(:backtrace).and_return(caller)

spec/support/helpers/stub_configuration.rb

@@ -120,6 +120,12 @@ def stub_sentry_settings(enabled: true)
       .to receive(:sentry_clientside_dsn) { clientside_dsn }
   end
 
+  def clear_sentry_settings
+    ::Sentry.get_current_scope.clear
+    ::Sentry.close
+    ::Raven.configuration = ::Raven::Configuration.new
+  end
+
   def stub_microsoft_graph_mailer_setting(messages)
     allow(Gitlab.config.microsoft_graph_mailer).to receive_messages(to_settings(messages))
   end