Fix failing flow tests

Summary:
Metro Bundler ships with `react_native_fb` flow annotations whereas our repo is set to ignore `react_native_oss` flow issues.

For now, a hot fix is to make our repo ignore both.

Detailed discussion happens here: facebook/metro@87cfc05#commitcomment-24884835

Those changes have been applied to `0.50.0-rc.0` in order to make it green.
Closes #16310

Differential Revision: D6031378

Pulled By: hramos

fbshipit-source-id: 491d866bb35bd6c30a27dbc04586b15144a8efb2

.flowconfig

@@ -46,8 +46,8 @@ suppress_type=$FlowFixMeProps
 suppress_type=$FlowFixMeState
 suppress_type=$FixMe
 
-suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(5[0-6]\\|[1-4][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native_oss[a-z,_]*\\)?)\\)
-suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(5[0-6]\\|[1-4][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*react_native_oss[a-z,_]*\\)?)\\)?:? #[0-9]+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(>=0\\.\\(5[0-6]\\|[1-4][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*[react_native_oss|react_native_fb][a-z,_]*\\)?)\\)
+suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(>=0\\.\\(5[0-6]\\|[1-4][0-9]\\|[0-9]\\).[0-9]\\)? *\\(site=[a-z,_]*[react_native_oss|react_native_fb][a-z,_]*\\)?)\\)?:? #[0-9]+
 suppress_comment=\\(.\\|\n\\)*\\$FlowFixedInNextDeploy
 suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError