ignore flipper-public/dist folder in build

Summary:
Builds in flipper-public are failing, because duplicate imports: https://our.intern.facebook.com/intern/sandcastle/job/22517998213713260

That's most likely because the `flipper-public` is not blacklisted in metro, so let's add it!

Reviewed By: passy

Differential Revision: D14134423

fbshipit-source-id: 52f87196957c8578b8ac7f578efa74e3c13fe1bb

scripts/build-utils.js

@@ -61,7 +61,7 @@ function compile(buildFolder, entry) {
         ),
       },
       resolver: {
-        blacklistRE: /\/sonar\/dist\//,
+        blacklistRE: /\/(sonar|flipper-public)\/dist\//,
       },
     },
     {

static/compilePlugins.js

@@ -207,7 +207,7 @@ async function compilePlugin(
             ),
           },
           resolver: {
-            blacklistRE: /\/sonar\/dist\//,
+            blacklistRE: /\/(sonar|flipper-public)\/dist\//,
           },
         },
         {