refactor: apply review fixes to S3 offloading implementation #5064

Job	Run time
Linting	37s
Build and Test PowerSync Service	1m 39s
Core Test	1m 1s
Convex Replication Test	2m 42s
MSSQL Test (2019)	5m 14s
MongoDB Storage Test (7.0)	1m 36s
MSSQL Test (2025)	6m 3s
MSSQL Test (2022)	5m 3s
MySQL Test (8.4)	2m 35s
MongoDB Storage Test (8.0)	1m 46s
MySQL Test (5.7)	3m 6s
MongoDB Storage Test (6.0)	1m 33s
MySQL Test (8)	2m 36s
MongoDB Replication Test (7.0)	3m 15s
MongoDB Replication Test (6.0)	3m 22s
Postgres Storage Test (11)	1m 31s
MongoDB Replication Test (8.0)	2m 58s
Postgres Storage Test (12)	1m 26s
Postgres Storage Test (14)	1m 37s
Postgres Storage Test (15)	1m 34s
Postgres Storage Test (13)	1m 37s
Postgres Storage Test (16)	1m 30s
Postgres Storage Test (17)	1m 34s
Postgres Replication Test (13)	8m 43s
Postgres Replication Test (16)	9m 23s
Postgres Replication Test (17)	9m 45s
Postgres Replication Test (18)	9m 20s
Postgres Replication Test (12)	9m 27s
Postgres Replication Test (14)	9m 36s
Postgres Replication Test (11)	8m 35s
Postgres Replication Test (15)	9m 32s
Postgres Storage Test (18)	1m 22s
	2h 11m 38s

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