Ensure that we don't kick off SolutionCrawler's Reanalyze functionality if...

Ensure that we don't kick off SolutionCrawler's Reanalyze functionality if solution crawler is turned off with the option `InternalSolutionCrawlerOptions.SolutionCrawler`.

This is needed for our internal RPS performance tests which intend to turn off solution crawler for certain scenarios to reduce noise from it.

src/Features/Core/Portable/SolutionCrawler/WorkCoordinator.cs

@@ -164,6 +164,12 @@ private void OnOptionChanged(object sender, OptionChangedEventArgs e)
                     return;
                 }
 
+                if (!_optionService.GetOption(InternalSolutionCrawlerOptions.SolutionCrawler))
+                {
+                    // Bail out if solution crawler is disabled.
+                    return;
+                }
+
                 ReanalyzeOnOptionChange(sender, e);
             }