Update codegen config to prevent naming collision of enum values (#7854)

In particular, the `LoginFlowSource` being generated resulted in a
TypeScript error due to the way the enum values are transformed. This
change prevents the two enum values from yielding a naming collision.


https://the-guild.dev/graphql/codegen/docs/config-reference/naming-convention#keep-names-as-is

Author: trevor-scheer

.changeset/odd-mayflies-camp.md

@@ -0,0 +1,2 @@
+---
+---

codegen.yml

@@ -1,4 +1,7 @@
 schema: https://graphql.api.apollographql.com/api/graphql
+config:
+  namingConvention:
+    enumValues: keep
 generates:
   ./packages/server/src/plugin/schemaReporting/generated/operations.d.ts:
     documents: packages/server/src/plugin/schemaReporting/schemaReporter.ts