feat(federation): implement minimal federation user backend #29406

Job	Run time
changes	8s
php8.5-s3-multibucket-minio	10m 40s
php8.3-s3-multibucket-minio	13m 18s
php8.5-s3-minio	8m 38s
php8.3-s3-minio	11m 55s
object-store-primary-summary	7s
	44m 46s

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