fix(cli): remove stale key after resolving env var in config keys#12885

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pronchakov:issue/12884/pulling-env-vars-in-yaml-keys-works-but-results-in-error-message-in-logspronchakov/apisix:issue/12884/pulling-env-vars-in-yaml-keys-works-but-results-in-error-message-in-logsCopy head branch name to clipboard