Remove `sendemail.php` #3671

Job	Run time
tests (postgres, debian, minio)	17m 15s
tests (postgres, ubi, local)	11m 20s
tests (postgres, debian, local)	16m 59s
build-images (ubuntu-24.04-arm, ubi)	2m 55s
build-images (ubuntu-24.04-arm, debian)	2m 51s
build-images (ubuntu-24.04, ubi)	2m 28s
build-images (ubuntu-24.04, debian)	3m 14s
	57m 2s

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