test: Skip flaky truffleruby test (#1512)

This test is failing on unrelated PRs. Issue #1507 is created to resolve
the source of the flakiness.

Author: kaylareopelle

exporter/otlp/test/opentelemetry/exporter/otlp/exporter_test.rb

@@ -533,6 +533,9 @@
     end
 
     it 'translates all the things' do
+      # TODO: See issue #1507 to fix
+      skip 'Intermittently fails' if RUBY_ENGINE == 'truffleruby'
+
       stub_request(:post, 'http://localhost:4318/v1/traces').to_return(status: 200)
       processor = OpenTelemetry::SDK::Trace::Export::BatchSpanProcessor.new(exporter)
       tracer = OpenTelemetry.tracer_provider.tracer('tracer', 'v0.0.1')