feat: mail snippets #17214

Job	Run time
Nextcloud master php8.1 unit tests	1m 7s
Nextcloud stable30 php8.1 unit tests	1m 10s
Nextcloud master php8.2 unit tests	1m 2s
Nextcloud stable30 php8.2 unit tests	49s
Nextcloud master php8.3 unit tests	58s
Front-end unit tests	1m 32s
Nextcloud stable30 php8.3 unit tests	1m 3s
master w/ php8.3-sqlite-nocache integration tests	2m 14s
Nextcloud master php8.4 unit tests	56s
master w/ php8.3-mysql-nocache integration tests	3m 0s
master w/ php8.3-pgsql-nocache integration tests	2m 17s
master w/ php8.1-sqlite-redis integration tests	8m 55s
master w/ php8.2-mysql-redis integration tests	9m 34s
stable30 w/ php8.2-mysql-redis integration tests	9m 8s
test-summary	4s
	43m 49s

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