Improve email headers for feedback mails #3272

Job	Run time
Javascript	3m 34s
Client	1m 16s
PHP (UnitTests, 7.2, PDO_MYSQL)	2m 50s
UI (0)	16m 42s
PHP (UnitTests, 8.2, MYSQLI)	3m 12s
UI (1)	24m 48s
PHP (SystemTestsPlugins, 7.2, PDO_MYSQL)	11m 47s
UI (2)	35m 17s
PHP (SystemTestsPlugins, 8.2, MYSQLI)	15m 6s
UI (3)	22m 20s
PHP (SystemTestsCore, 7.2, PDO_MYSQL)	11m 7s
PHP (SystemTestsCore, 8.2, MYSQLI)	11m 48s
PHP (IntegrationTestsCore, 7.2, PDO_MYSQL)	11m 36s
PHP (IntegrationTestsCore, 8.2, MYSQLI)	14m 41s
PHP (IntegrationTestsPlugins, 7.2, PDO_MYSQL)	32m 53s
PHP (IntegrationTestsPlugins, 8.2, MYSQLI)	37m 17s
	4h 16m 14s

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