test: Add workaround for windows test failure (#1751)

We have to instantiate the processor outside of the stub so that the
stub can be applied to the processor, but the method we're stubbing
runs on initialization, so we sometimes run out of expectations.

If we explicitly set 'OTEL_RUBY_BLRP_START_THREAD_ON_BOOT' to 'false'
for the 'removes the older log records from the batch if full' test, the
stubbed `work` method will not run outside of the stub block.

Co-authored-by: Tanna McClure <tannalynn@users.noreply.github.com>

logs_sdk/test/opentelemetry/sdk/logs/export/batch_log_record_processor_test.rb

@@ -186,20 +186,23 @@ def to_log_record_data
     end
 
     it 'removes the older log records from the batch if full' do
-      processor = BatchLogRecordProcessor.new(TestExporter.new, max_queue_size: 1, max_export_batch_size: 1)
+      # Windows intermittently fails if we don't set this
+      OpenTelemetry::TestHelpers.with_env('OTEL_RUBY_BLRP_START_THREAD_ON_BOOT' => 'false') do
+        processor = BatchLogRecordProcessor.new(TestExporter.new, max_queue_size: 1, max_export_batch_size: 1)
 
-      # Don't actually try to export, we're looking at the log records array
-      processor.stub(:work, nil) do
-        older_log_record = TestLogRecord.new
-        newest_log_record = TestLogRecord.new
+        # Don't actually try to export, we're looking at the log records array
+        processor.stub(:work, nil) do
+          older_log_record = TestLogRecord.new
+          newest_log_record = TestLogRecord.new
 
-        processor.on_emit(older_log_record, mock_context)
-        processor.on_emit(newest_log_record, mock_context)
+          processor.on_emit(older_log_record, mock_context)
+          processor.on_emit(newest_log_record, mock_context)
 
-        records = processor.instance_variable_get(:@log_records)
+          records = processor.instance_variable_get(:@log_records)
 
-        assert_includes(records, newest_log_record)
-        refute_includes(records, older_log_record)
+          assert_includes(records, newest_log_record)
+          refute_includes(records, older_log_record)
+        end
       end
     end