delete unused scripts/upload.py #8281

Job	Run time
verify-internal-link-anchors	19s
check-unclosed-tags	12s
check-control-characters	9s
check-manual-line-breaks	12s
check-file-encoding	9s
verify-internal-links	1m 14s
check-git-conflicts	10s
markdownlint	22s
	2m 47s

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