chore: remove duplicated DatabaseMessageMapper injection #16445

Job	Run time
Nextcloud master php8.1 unit tests	1m 19s
Nextcloud master php8.1 unit tests	1m 14s
Front-end unit tests	1m 2s
Front-end unit tests	1m 2s
Nextcloud master php8.2 unit tests	1m 24s
Nextcloud master php8.2 unit tests	2m 10s
Nextcloud master php8.3 unit tests	1m 27s
Nextcloud master php8.3 unit tests	1m 44s
master w/ php8.3-sqlite-nocache integration tests	3m 35s
master w/ php8.3-sqlite-nocache integration tests	3m 35s
master w/ php8.3-mysql-nocache integration tests	3m 54s
master w/ php8.3-mysql-nocache integration tests	3m 54s
master w/ php8.3-pgsql-nocache integration tests	3m 18s
master w/ php8.3-pgsql-nocache integration tests	3m 18s
master w/ php8.1-sqlite-redis integration tests	4m 41s
master w/ php8.1-sqlite-redis integration tests	4m 41s
master w/ php8.2-mysql-redis integration tests	5m 29s
master w/ php8.2-mysql-redis integration tests	5m 29s
test-summary	4s
test-summary	6s
	53m 26s

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