add more explicit ignore for generated code

Signed-off-by: Jordan Dubrick <[email protected]>

Author: Jdubrick

.codecov.yaml

@@ -44,7 +44,7 @@ coverage:
     - "vendor/*"
     - "Makefile"
     - ".travis.yml"
-    - "**/*.gen.go"
+    - "index/server/pkg/server/endpoint.gen.go"
 
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