Validate downloaded theme assets against extension and MIME allowlists #1124

Job	Run time
Compute previous WordPress version	3s
Lint	59s
E2E Tests	2m 42s
PHP 8.0	2m 22s
PHP 8.2 (WP previous major version)	2m 20s
PHP 7.4 (WP previous major version)	2m 3s
PHP 8.2	2m 17s
PHP 8.3	2m 8s
PHP 8.1	2m 9s
PHP 8.0 (WP previous major version)	2m 18s
PHP 8.3 (WP previous major version)	2m 14s
PHP 7.4	2m 25s
PHP 8.1 (WP previous major version)	2m 13s
	26m 13s

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