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Reject `owner/repo` in `--repo`, deprecate `--pending-head` #553

Job	Run time
inspect	5s
python-sfw-smoke-enterprise	19s
dockerfile-smoke (${{ matrix.arch }})	-1s
fixture-npm-sfw-smoke-free	-1s
workflow-notice	-1s
fixture-pypi-sfw-smoke-free	-1s
fixture-pypi-sfw-smoke-enterprise	-1s
python-sfw-smoke-free	-1s
fixture-npm-sfw-smoke-enterprise	-1s
dependency-review-gate	4s
	21s