Stop tracking generated files

Run make generate in CI lint and test jobs since generated files are
now gitignored. Also include Relay codegen for frontend apps in the
generate target.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

.gitignore

@@ -13,3 +13,7 @@ sbom-docker.json
 *.crt
 *.key
 compose/keycloak/probo-realm.json
+
+# Generated files (codegen)
+__generated__/
+pkg/server/api/*/v1/types/types.go