[BE] switch to hermes parser for prettier (#30421)

This will allow us to parse new flow syntax since the `flow` parser is
no longer updated.

I had to exclude some files and have them fall back to `flow` parser
since they contain invalid graphql syntax that makes the plugin crash.

scripts/flow/config/flowconfig

@@ -14,6 +14,9 @@
 .*/__mocks__/.*
 .*/__tests__/.*
 
+# contains modern flow syntax that requires a Flow upgrade
+.*/node_modules/prettier-plugin-hermes-parser/.*
+
 # TODO: noop should get its own inlinedHostConfig entry
 .*/packages/react-noop-renderer/.*