fix(theming): preserve uploaded favicon and touch icon #26856

Job	Run time
changes	7s
php8.3-s3-multibucket-minio	15m 14s
php8.5-s3-multibucket-minio	6m 52s
php8.3-s3-minio	15m 47s
php8.5-s3-minio	6m 52s
object-store-primary-summary	8s
	45m 0s

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