Enable RS0101 (Avoid multiple blank lines)

This change excludes src/Compilers from the analysis.

eng/config/rulesets/Shipping.ruleset

@@ -115,7 +115,6 @@
     <Rule Id="RS0026" Action="Error" />
     <Rule Id="RS0027" Action="Error" />
     <Rule Id="RS0040" Action="None" /> <!-- Defaultable types should have defaultable fields -->
-    <Rule Id="RS0101" Action="None" /> <!-- Avoid multiple blank lines -->
   </Rules>
   <Rules AnalyzerId="Microsoft.NetCore.Analyzers" RuleNamespace="Microsoft.NetCore.Analyzers.ImmutableCollections">
     <Rule Id="RS0012" Action="Warning" />

src/Compilers/.editorconfig

@@ -6,6 +6,9 @@ dotnet_naming_style.local_function_style.capitalization = camel_case
 # RS0100: Statements must be placed on their own line
 dotnet_diagnostic.RS0100.severity = none
 
+# RS0101: Avoid multiple blank lines
+dotnet_diagnostic.RS0101.severity = none
+
 # RS0102: Braces must not have blank lines between them
 dotnet_diagnostic.RS0102.severity = none