build: --credential-file-override is no longer required (#632)

@chingor13 has configured our runtime environment, such that we no longer need to explicitly provide a credentials file. How does this magic work, I didn't fully understand?
googleapis · Aug 8, 2020 · 94421c4 · 94421c4
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diff --git a/synthtool/gcp/templates/node_library/.kokoro/populate-secrets.sh b/synthtool/gcp/templates/node_library/.kokoro/populate-secrets.sh