files: abort with 500 on upload failures #1369

Job	Run time
Tests (3.7, pypi, redis, postgresql11, opensearch1)	4m 24s
Tests (3.7, pypi, redis, postgresql11, elasticsearch7)	4m 9s
Tests (3.7, pypi, redis, mysql5, opensearch1)	6m 5s
Tests (3.7, pypi, redis, mysql5, elasticsearch7)	5m 0s
Tests (3.8, pypi, redis, postgresql11, opensearch1)	5m 21s
Tests (3.8, pypi, redis, postgresql11, elasticsearch7)	5m 54s
Tests (3.8, pypi, redis, postgresql13, opensearch1)	5m 55s
Tests (3.8, pypi, redis, postgresql13, elasticsearch7)	5m 53s
Tests (3.8, pypi, redis, mysql5, opensearch1)	5m 14s
Tests (3.8, pypi, redis, mysql5, elasticsearch7)	4m 46s
Tests (3.8, pypi, redis, mysql8, opensearch1)	6m 8s
Tests (3.8, pypi, redis, mysql8, elasticsearch7)	6m 16s
Tests (3.9, pypi, redis, postgresql11, opensearch1)	4m 22s
Tests (3.9, pypi, redis, postgresql11, elasticsearch7)	5m 9s
Tests (3.9, pypi, redis, postgresql13, opensearch1)	5m 30s
Tests (3.9, pypi, redis, postgresql13, elasticsearch7)	4m 15s
Tests (3.9, pypi, redis, mysql5, opensearch1)	5m 31s
Tests (3.9, pypi, redis, mysql5, elasticsearch7)	5m 27s
Tests (3.9, pypi, redis, mysql8, opensearch1)	6m 34s
Tests (3.9, pypi, redis, mysql8, elasticsearch7)	7m 10s
	1h 49m 3s

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